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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Quantum PHP Framework  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * An open source software development framework for PHP  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package Quantum  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author Arman Ag. <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright Copyright (c) 2018 Softberg LLC (https://softberg.org)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link http://quantum.softberg.org/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @since 2.9.8  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Quantum\Libraries\Validation\Traits;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Trait Resource  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package Quantum\Libraries\Validation\Rules  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait Resource  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Checks for valid URL or subdomain  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $field  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function url(string $field, string $value): bool  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return filter_var($value, FILTER_VALIDATE_URL) !== false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Checks to see if the url exists  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $field  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    protected function urlExists(string $field, string $value): bool  | 
            
                            
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                        if (filter_var($value, FILTER_VALIDATE_URL) === false) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $host = parse_url(strtolower($value), PHP_URL_HOST);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (!$host) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (function_exists('checkdnsrr') && function_exists('idn_to_ascii')) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return checkdnsrr(idn_to_ascii($host, 0, INTL_IDNA_VARIANT_UTS46), 'A');  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        } else { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return gethostbyname($host) !== $host;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Checks for valid IP address  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $field  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function ip(string $field, string $value): bool  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return filter_var($value, FILTER_VALIDATE_IP) !== false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Checks for valid IPv4 address  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $field  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function ipv4(string $field, string $value): bool  | 
            
                            
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                        return filter_var($value, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Checks for valid IPv6 address  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $field  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $value  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    protected function ipv6(string $field, string $value): bool  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return filter_var($value, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false;  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                        
This check looks for parameters that have been defined for a function or method, but which are not used in the method body.