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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  class Debug { | 
            
                            
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                    public static $stack;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $initialized = false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function __construct() {} | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static function initialize() { | 
            
                            
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                      if (self::$initialized)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::$stack = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::$initialized = true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static function out( $_object ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      if(is_object($_object)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo "isObject";  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      } else if(is_array($_object)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        arrayDump($_object, "Debug");  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo $_object;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public static function error( $_object ) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                      self::out(["Error" => $_object]);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public static function warning( $_object ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::out(["Warning" => $_object]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function fatal( $_object ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::out(["Fatal error" => $_object]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      exit(1);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function logln( $_object ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::log($_object);  | 
            
                            
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                      self::out("<br>"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function logStack( $_object ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::out([  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "position" => self::$stack,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "error" => $_object  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      ]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::out("<br>"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function push() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      $debugInfo = debug_backtrace();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      $debugInfo = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "file" => $debugInfo[1]["file"],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "line" => $debugInfo[1]["line"],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "function" => $debugInfo[1]["function"],  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        "class" => $debugInfo[1]["class"]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::$stack[] = $debugInfo;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function pop() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      if(count(self::$stack)>0)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        array_shift(self::$stack);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public static function emptyStack() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                      self::$stack = [];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                  }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                ?>  | 
            
                            
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You can fix this by adding a namespace to your class:
When choosing a vendor namespace, try to pick something that is not too generic to avoid conflicts with other libraries.