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                <?php  | 
            
                            
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                	require_once("mod_selector/nodes.php"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	require_once("mod_selector/parser.php"); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	class selector { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		protected $nodes;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function __construct($string) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$parser = new selectorParser($string);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->nodes = $parser->parse();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function run($count, $offset = 0, $definitions = Array()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if (!$this->nodes) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if ($offset >= $count) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$result = $this->nodes->run($count, $offset);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			if (isset($definitions[$result])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                				$result = $definitions[$result];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $result;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function getIterator($count, $definitions = Array()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return new selectorIterator($this, $count, $definitions);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	class selectorIterator implements Iterator { | 
            
                            
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                		public function __construct($selector, $count, $definitions = Array()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->selector		= $selector;  | 
            
                            
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                			$this->count		= $count;  | 
            
                            
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                			$this->offset		= 0;  | 
            
                            
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                			$this->definitions	= $definitions;  | 
            
                            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function current() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->selector->run($this->count, $this->offset, $this->definitions);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function key() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->offset;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function next() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->offset = $this->offset + 1;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function rewind() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->offset = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function valid() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return ($this->offset >= 0);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	class pinp_selector extends selector { | 
            
                            
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                		public function _create($string) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return new pinp_selector($string);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function _run($count, $offset = 0, $definitions = Array()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->run($count, $offset, $definitions);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function _getIterator($count, $definitions = Array()) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return new pinp_selectorIterator($count, $definitions);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	class pinp_selectorIterator extends selectorIterator { | 
            
                            
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                		public function __construct($selector, $count, $definitions = Array()) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                			return parent::__construct($selector, $count, $definitions);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function _current() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->current();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function _key() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->key();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function _next() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->next();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function _rewind() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->rewind();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		public function _valid() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			return $this->valid();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                        
            
                                    
            
            
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The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.