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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Jetpack Stats package.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package  automattic/jetpack-stats  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Automattic\Jetpack;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class Stats, used to record stats using https://pixel.wp.com/g.gif  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Stats { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Holds the stats to be processed  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @var array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	private $stats = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Indicates whether to use the transparent pixel (b.gif) instead of the regular smiley (g.gif)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @var boolean  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public $use_transparent_pixel = false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Class Constructor  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param boolean $use_transparent_pixel Use the transparent pixel instead of the smiley.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	 */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	public function __construct( $use_transparent_pixel = false ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$this->use_transparent_pixel = $use_transparent_pixel;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Store a stat for later output.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param string $group The stat group.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param string $name The stat name to bump.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return boolean true if stat successfully added  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function add( $group, $name ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( ! \is_string( $group ) || ! \is_string( $name ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( ! isset( $this->stats[ $group ] ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->stats[ $group ] = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( \in_array( $name, $this->stats[ $group ], true ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->stats[ $group ][] = $name;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Gets current stats stored to be processed  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return array $stats  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function get_current_stats() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $this->stats;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Return the stats from a group in an array ready to be added as parameters in a query string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param string $group_name The name of the group to retrieve.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return array Array with one item, where the key is the prefixed group and the value are all stats concatenated with a comma. If group not found, an empty array will be returned  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function get_group_query_args( $group_name ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$stats = $this->get_current_stats();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( isset( $stats[ $group_name ] ) && ! empty( $stats[ $group_name ] ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return array( "x_jetpack-{$group_name}" => implode( ',', $stats[ $group_name ] ) ); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Gets a list of trac URLs for every stored URL  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return array An array of URLs  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function get_stats_urls() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$urls = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $this->get_current_stats() as $group => $stat ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$group_query_string = $this->get_group_query_args( $group );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$urls[]             = $this->build_stats_url( $group_query_string );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $urls;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Outputs the tracking pixels for the current stats and empty the stored stats from the object  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function do_stats() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$urls = $this->get_stats_urls();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $urls as $url ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			echo '<img src="' . esc_url( $url ) . '" width="1" height="1" style="display:none;" />';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->stats = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Pings the stats server for the current stats and empty the stored stats from the object  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function do_server_side_stats() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$urls = $this->get_stats_urls();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		foreach ( $urls as $url ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->do_server_side_stat( $url );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->stats = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Runs stats code for a one-off, server-side.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param string $url string The URL to be pinged. Should include `x_jetpack-{$group}={$stats}` or whatever we want to store. | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return bool If it worked.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                                                    
                                                                                                        
            
            
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                	public function do_server_side_stat( $url ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$response = wp_remote_get( esc_url_raw( $url ) );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( is_wp_error( $response ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( 200 !== wp_remote_retrieve_response_code( $response ) ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * Builds the stats url.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param array $args array|string The arguments to append to the URL.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return string The URL to be pinged.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function build_stats_url( $args ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$defaults = array(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'v'    => 'wpcom2',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'rand' => md5( wp_rand( 0, 999 ) . time() ),  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$args     = wp_parse_args( $args, $defaults );  | 
            
                            
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                		$gifname  = true === $this->use_transparent_pixel ? 'b.gif' : 'g.gif';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		 * Filter the URL used as the Stats tracking pixel.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		 * @since 2.3.2  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		 * @param string $url Base URL used as the Stats tracking pixel.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    174
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                		$base_url = apply_filters(  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    175
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                			'jetpack_stats_base_url',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			'https://pixel.wp.com/' . $gifname  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    178
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                		$url      = add_query_arg( $args, $base_url );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    179
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                		return $url;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    180
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    182
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                }  | 
            
            
                                                        
            
                                    
            
            
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It seems like the type of the argument is not accepted by the function/method which you are calling.
In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug.
We suggest to add an explicit type cast like in the following example: