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                <?php  | 
            
                            
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                require_once(dirname(__FILE__).'/AbstractConfirmationToken.php');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                require_once(dirname(dirname(dirname(__FILE__))).'/control/Director.php');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                require_once(dirname(dirname(dirname(__FILE__))).'/view/TemplateGlobalProvider.php');  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This is used to protect dangerous URLs that need to be detected early in the request lifecycle  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * by generating a one-time-use token & redirecting with that token included in the redirected URL  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @internal This class is designed specifically for use pre-startup and may change without warning  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class URLConfirmationToken extends AbstractConfirmationToken { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected $urlToCheck;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected $currentURL;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @var string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected $tokenParameterName;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @param string $urlToCheck URL to check  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function __construct($urlToCheck)  | 
            
                            
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                	{ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->urlToCheck = $urlToCheck;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		global $url;  | 
            
                            
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                		// Strip leading/trailing slashes  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->currentURL = preg_replace(array('/\/+/','/^\//', '/\/$/'), array('/','',''), $url); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$this->tokenParameterName = preg_replace('/[^a-z0-9]/i', '', $urlToCheck) . 'token'; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// If the token provided is valid, mark it as such  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$token = isset($_GET[$this->tokenParameterName]) ? $_GET[$this->tokenParameterName] : null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ($this->checkToken($token)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			$this->token = $token;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function urlMatches() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return ($this->currentURL === $this->urlToCheck);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	/**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function getURLToCheck() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $this->urlToCheck;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function reloadRequired() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $this->urlMatches() && !$this->tokenProvided();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function suppress() { | 
            
                            
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                		$_SERVER['REQUEST_URI'] = '/';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$_GET['url'] = $_REQUEST['url'] = '/';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                	public function params($includeToken = true) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                		$params = array();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		if ($includeToken) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                			$params[$this->tokenParameterName] = $this->genToken();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		return $params;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function currentURL() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return Director::baseURL() . $this->currentURL;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function getRedirectUrlBase() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return (!$this->urlMatches()) ? Director::baseURL() : $this->currentURL();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	public function getRedirectUrlParams() { | 
            
                            
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                		$params = (!$this->urlMatches())  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			? $this->params()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			: array_merge($_GET, $this->params());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if (isset($params['url'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			unset($params['url']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $params;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	protected function redirectURL() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		$query = http_build_query($this->getRedirectUrlParams());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		return $this->getRedirectUrlBase() . '?' . $query;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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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.