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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Noodlehaus\Parser;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Noodlehaus\Exception\ParseException;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * XML parser  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package    Config  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author     Jesus A. Domingo <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author     Hassan Khan <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author     Filip Š <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link       https://github.com/noodlehaus/config  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license    MIT  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class Xml implements ParserInterface  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritDoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Parses an XML file as an array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws ParseException If there is an error parsing the XML file  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function parseFile($filename)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        libxml_use_internal_errors(true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data = simplexml_load_file($filename, null, LIBXML_NOERROR);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->parse($data, $filename);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritDoc} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Parses an XML string as an array  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws ParseException If there is an error parsing the XML string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function parseString($config)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        libxml_use_internal_errors(true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data = simplexml_load_string($config, null, LIBXML_NOERROR);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->parse($data);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Completes parsing of XML data  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  array   $data  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  strring $filename  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @throws ParseException If there is an error parsing the XML data  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function parse($data = null, $filename = null)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($data === false) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $errors      = libxml_get_errors();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $latestError = array_pop($errors);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $error       = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'message' => $latestError->message,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'type'    => $latestError->level,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'code'    => $latestError->code,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'file'    => $filename,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                'line'    => $latestError->line,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            throw new ParseException($error);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $data = json_decode(json_encode($data), true);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $data;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * {@inheritDoc} | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                        
            
                                    
            
            
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                    public static function getSupportedExtensions()  | 
            
            
                                                        
            
                                    
            
            
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                        return ['xml'];  | 
            
            
                                                        
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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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: