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<?php/* SVN FILE: $Id: validation.php 8004 2009-01-16 20:15:21Z gwoo $ *//*** Validation Class. Used for validation of model data** Long description for file** PHP versions 4 and 5** CakePHP(tm) : Rapid Development Framework (http://www.cakephp.org)* Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)** Licensed under The MIT License* Redistributions of files must retain the above copyright notice.** @filesource* @copyright Copyright 2005-2008, Cake Software Foundation, Inc. (http://www.cakefoundation.org)* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project* @package cake* @subpackage cake.cake.libs* @since CakePHP(tm) v 1.2.0.3830* @version $Revision: 8004 $* @modifiedby $LastChangedBy: gwoo $* @lastmodified $Date: 2009-01-16 12:15:21 -0800 (Fri, 16 Jan 2009) $* @license http://www.opensource.org/licenses/mit-license.php The MIT License*//*** Deprecated*//*** Not empty.*/define('VALID_NOT_EMPTY', '/.+/');/*** Numbers [0-9] only.*/define('VALID_NUMBER', '/^[-+]?\\b[0-9]*\\.?[0-9]+\\b$/');/*** A valid email address.*/define('VALID_EMAIL', "/^[a-z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+(?:[a-z]{2,4}|museum|travel)$/i");/*** A valid year (1000-2999).*/define('VALID_YEAR', '/^[12][0-9]{3}$/');/*** Offers different validation methods.** Long description for file** @package cake* @subpackage cake.cake.libs* @since CakePHP v 1.2.0.3830*/class Validation extends Object {/*** Set the the value of methods $check param.** @var string* @access public*/var $check = null;/*** Set to a valid regular expression in the class methods.* Can be set from $regex param also** @var string* @access public*/var $regex = null;/*** Some complex patterns needed in multiple places** @var array* @access private*/var $__pattern = array('ip' => '(?:(?:25[0-5]|2[0-4][0-9]|(?:(?:1[0-9])?|[1-9]?)[0-9])\.){3}(?:25[0-5]|2[0-4][0-9]|(?:(?:1[0-9])?|[1-9]?)[0-9])','hostname' => '(?:[a-z0-9][-a-z0-9]*\.)*(?:[a-z0-9][-a-z0-9]{0,62})\.(?:(?:[a-z]{2}\.)?[a-z]{2,4}|museum|travel)');/*** Some class methods use a country to determine proper validation.* This can be passed to methods in the $country param** @var string* @access public*/var $country = null;/*** Some class methods use a deeper validation when set to true** @var string* @access public*/var $deep = null;/*** Some class methods use the $type param to determine which validation to perfom in the method** @var string* @access public*/var $type = null;/*** Holds an array of errors messages set in this class.* These are used for debugging purposes** @var array* @access public*/var $errors = array();/*** Gets a reference to the Validation object instance** @return object Validation instance* @access public* @static*/function &getInstance() {static $instance = array();if (!$instance) {$instance[0] =& new Validation();}return $instance[0];}/*** Checks that a string contains something other than whitespace** Returns true if string contains something other than whitespace** $check can be passed as an array:* array('check' => 'valueToCheck');** @param mixed $check Value to check* @return boolean Success* @access public*/function notEmpty($check) {$_this =& Validation::getInstance();$_this->__reset();$_this->check = $check;if (is_array($check)) {$_this->_extract($check);}if (empty($_this->check) && $_this->check != '0') {return false;}$_this->regex = '/[^\s]+/m';return $_this->_check();}/*** Checks that a string contains only integer or letters** Returns true if string contains only integer or letters** $check can be passed as an array:* array('check' => 'valueToCheck');** @param mixed $check Value to check* @return boolean Success* @access public*/function alphaNumeric($check) {$_this =& Validation::getInstance();$_this->__reset();$_this->check = $check;if (is_array($check)) {$_this->_extract($check);}if (empty($_this->check) && $_this->check != '0') {return false;}$_this->regex = '/^[\p{Ll}\p{Lm}\p{Lo}\p{Lt}\p{Lu}\p{Nd}]+$/mu';return $_this->_check();}/*** Checks that a string length is within s specified range.* Spaces are included in the character count.* Returns true is string matches value min, max, or between min and max,** @param string $check Value to check for length* @param integer $min Minimum value in range (inclusive)* @param integer $max Maximum value in range (inclusive)* @return boolean Success* @access public*/function between($check, $min, $max) {$length = strlen($check);return ($length >= $min && $length <= $max);}/*** Returns true if field is left blank -OR- only whitespace characters are present in it's value* Whitespace characters include Space, Tab, Carriage Return, Newline** $check can be passed as an array:* array('check' => 'valueToCheck');** @param mixed $check Value to check* @return boolean Success* @access public*/function blank($check) {$_this =& Validation::getInstance();$_this->__reset();$_this->check = $check;if (is_array($check)) {$_this->_extract($check);}$_this->regex = '/[^\\s]/';return !$_this->_check();}/*** Validation of credit card numbers.* Returns true if $check is in the proper credit card format.** @param mixed $check credit card number to validate* @param mixed $type 'all' may be passed as a sting, defaults to fast which checks format of most major credit cards* if an array is used only the values of the array are checked.* Example: array('amex', 'bankcard', 'maestro')* @param boolean $deep set to true this will check the Luhn algorithm of the credit card.* @param string $regex A custom regex can also be passed, this will be used instead of the defined regex values* @return boolean Success* @access public* @see Validation::_luhn()*/function cc($check, $type = 'fast', $deep = false, $regex = null) {$_this =& Validation::getInstance();$_this->__reset();$_this->check = $check;$_this->type = $type;$_this->deep = $deep;$_this->regex = $regex;if (is_array($check)) {$_this->_extract($check);}$_this->check = str_replace(array('-', ' '), '', $_this->check);if (strlen($_this->check) < 13) {return false;}if (!is_null($_this->regex)) {if ($_this->_check()) {return $_this->_luhn();}}$cards = array('all' => array('amex' => '/^3[4|7]\\d{13}$/','bankcard' => '/^56(10\\d\\d|022[1-5])\\d{10}$/','diners' => '/^(?:3(0[0-5]|[68]\\d)\\d{11})|(?:5[1-5]\\d{14})$/','disc' => '/^(?:6011|650\\d)\\d{12}$/','electron' => '/^(?:417500|4917\\d{2}|4913\\d{2})\\d{10}$/','enroute' => '/^2(?:014|149)\\d{11}$/','jcb' => '/^(3\\d{4}|2100|1800)\\d{11}$/','maestro' => '/^(?:5020|6\\d{3})\\d{12}$/','mc' => '/^5[1-5]\\d{14}$/','solo' => '/^(6334[5-9][0-9]|6767[0-9]{2})\\d{10}(\\d{2,3})?$/','switch' => '/^(?:49(03(0[2-9]|3[5-9])|11(0[1-2]|7[4-9]|8[1-2])|36[0-9]{2})\\d{10}(\\d{2,3})?)|(?:564182\\d{10}(\\d{2,3})?)|(6(3(33[0-4][0-9])|759[0-9]{2})\\d{10}(\\d{2,3})?)$/','visa' => '/^4\\d{12}(\\d{3})?$/','voyager' => '/^8699[0-9]{11}$/'),'fast' => '/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6011[0-9]{12}|3(?:0[0-5]|[68][0-9])[0-9]{11}|3[47][0-9]{13})$/');if (is_array($_this->type)) {foreach ($_this->type as $value) {$_this->regex = $cards['all'][strtolower($value)];if ($_this->_check()) {return $_this->_luhn();}}} elseif ($_this->type == 'all') {foreach ($cards['all'] as $value) {$_this->regex = $value;if ($_this->_check()) {return $_this->_luhn();}}} else {$_this->regex = $cards['fast'];if ($_this->_check()) {return $_this->_luhn();}}}/*** Used to compare 2 numeric values.** @param mixed $check1 if string is passed for a string must also be passed for $check2* used as an array it must be passed as array('check1' => value, 'operator' => 'value', 'check2' -> value)* @param string $operator Can be either a word or operand* is greater >, is less <, greater or equal >=* less or equal <=, is less <, equal to ==, not equal !=* @param integer $check2 only needed if $check1 is a string* @return boolean Success* @access public*/function comparison($check1, $operator = null, $check2 = null) {if (is_array($check1)) {extract($check1, EXTR_OVERWRITE);}$operator = str_replace(array(' ', "\t", "\n", "\r", "\0", "\x0B"), '', strtolower($operator));switch ($operator) {case 'isgreater':case '>':if ($check1 > $check2) {return true;}break;case 'isless':case '<':if ($check1 < $check2) {return true;}break;case 'greaterorequal':case '>=':if ($check1 >= $check2) {return true;}break;case 'lessorequal':case '<=':if ($check1 <= $check2) {return true;}break;case 'equalto':case '==':if ($check1 == $check2) {return true;}break;case 'notequal':case '!=':if ($check1 != $check2) {return true;}break;default:$_this =& Validation::getInstance();$_this->errors[] = __('You must define the $operator parameter for Validation::comparison()', true);break;}return false;}/*** Used when a custom regular expression is needed.** @param mixed $check When used as a string, $regex must also be a valid regular expression.* As and array: array('check' => value, 'regex' => 'valid regular expression')* @param string $regex If $check is passed as a string, $regex must also be set to valid regular expression* @return boolean Success* @access public*/function custom($check, $regex = null) {$_this =& Validation::getInstance();$_this->__reset();$_this->check = $check;$_this->regex = $regex;if (is_array($check)) {$_this->_extract($check);}if ($_this->regex === null) {$_this->errors[] = __('You must define a regular expression for Validation::custom()', true);return false;}return $_this->_check();}/*** Date validation, determines if the string passed is a valid date.* keys that expect full month, day and year will validate leap years** @param string $check a valid date string* @param mixed $format Use a string or an array of the keys below. Arrays should be passed as array('dmy', 'mdy', etc)* Keys: dmy 27-12-2006 or 27-12-06 separators can be a space, period, dash, forward slash* mdy 12-27-2006 or 12-27-06 separators can be a space, period, dash, forward slash* ymd 2006-12-27 or 06-12-27 separators can be a space, period, dash, forward slash* dMy 27 December 2006 or 27 Dec 2006* Mdy December 27, 2006 or Dec 27, 2006 comma is optional* My December 2006 or Dec 2006* my 12/2006 separators can be a space, period, dash, forward slash* @param string $regex If a custom regular expression is used this is the only validation that will occur.* @return boolean Success* @access public*/function date($check, $format = 'ymd', $regex = null) {$_this =& Validation::getInstance();$_this->__reset();$_this->check = $check;$_this->regex = $regex;if (!is_null($_this->regex)) {return $_this->_check();}$regex['dmy'] = '%^(?:(?:31(\\/|-|\\.|\\x20)(?:0?[13578]|1[02]))\\1|(?:(?:29|30)(\\/|-|\\.|\\x20)(?:0?[1,3-9]|1[0-2])\\2))(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$|^(?:29(\\/|-|\\.|\\x20)0?2\\3(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:0?[1-9]|1\\d|2[0-8])(\\/|-|\\.|\\x20)(?:(?:0?[1-9])|(?:1[0-2]))\\4(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$%';$regex['mdy'] = '%^(?:(?:(?:0?[13578]|1[02])(\\/|-|\\.|\\x20)31)\\1|(?:(?:0?[13-9]|1[0-2])(\\/|-|\\.|\\x20)(?:29|30)\\2))(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$|^(?:0?2(\\/|-|\\.|\\x20)29\\3(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00))))$|^(?:(?:0?[1-9])|(?:1[0-2]))(\\/|-|\\.|\\x20)(?:0?[1-9]|1\\d|2[0-8])\\4(?:(?:1[6-9]|[2-9]\\d)?\\d{2})$%';$regex['ymd'] = '%^(?:(?:(?:(?:(?:1[6-9]|[2-9]\\d)?(?:0[48]|[2468][048]|[13579][26])|(?:(?:16|[2468][048]|[3579][26])00)))(\\/|-|\\.|\\x20)(?:0?2\\1(?:29)))|(?:(?:(?:1[6-9]|[2-9]\\d)?\\d{2})(\\/|-|\\.|\\x20)(?:(?:(?:0?[13578]|1[02])\\2(?:31))|(?:(?:0?[1,3-9]|1[0-2])\\2(29|30))|(?:(?:0?[1-9])|(?:1[0-2]))\\2(?:0?[1-9]|1\\d|2[0-8]))))$%';$regex['dMy'] = '/^((31(?!\\ (Feb(ruary)?|Apr(il)?|June?|(Sep(?=\\b|t)t?|Nov)(ember)?)))|((30|29)(?!\\ Feb(ruary)?))|(29(?=\\ Feb(ruary)?\\ (((1[6-9]|[2-9]\\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00)))))|(0?[1-9])|1\\d|2[0-8])\\ (Jan(uary)?|Feb(ruary)?|Ma(r(ch)?|y)|Apr(il)?|Ju((ly?)|(ne?))|Aug(ust)?|Oct(ober)?|(Sep(?=\\b|t)t?|Nov|Dec)(ember)?)\\ ((1[6-9]|[2-9]\\d)\\d{2})$/';$regex['Mdy'] = '/^(?:(((Jan(uary)?|Ma(r(ch)?|y)|Jul(y)?|Aug(ust)?|Oct(ober)?|Dec(ember)?)\\ 31)|((Jan(uary)?|Ma(r(ch)?|y)|Apr(il)?|Ju((ly?)|(ne?))|Aug(ust)?|Oct(ober)?|(Sept|Nov|Dec)(ember)?)\\ (0?[1-9]|([12]\\d)|30))|(Feb(ruary)?\\ (0?[1-9]|1\\d|2[0-8]|(29(?=,?\\ ((1[6-9]|[2-9]\\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00)))))))\\,?\\ ((1[6-9]|[2-9]\\d)\\d{2}))$/';$regex['My'] = '%^(Jan(uary)?|Feb(ruary)?|Ma(r(ch)?|y)|Apr(il)?|Ju((ly?)|(ne?))|Aug(ust)?|Oct(ober)?|(Sep(?=\\b|t)t?|Nov|Dec)(ember)?)[ /]((1[6-9]|[2-9]\\d)\\d{2})$%';$regex['my'] = '%^(((0[123456789]|10|11|12)([- /.])(([1][9][0-9][0-9])|([2][0-9][0-9][0-9]))))$%';$format = (is_array($format)) ? array_values($format) : array($format);foreach ($format as $key) {$_this->regex = $regex[$key];if ($_this->_check() === true) {return true;}}return false;}/*** Time validation, determines if the string passed is a valid time.* Validates time as 24hr (HH:MM) or am/pm ([H]H:MM[a|p]m)* Does not allow/validate seconds.** @param string $check a valid time string* @return boolean Success* @access public*/function time($check) {$_this =& Validation::getInstance();$_this->__reset();$_this->check = $check;$_this->regex = '%^((0?[1-9]|1[012])(:[0-5]\d){0,2}([AP]M|[ap]m))$|^([01]\d|2[0-3])(:[0-5]\d){0,2}$%';return $_this->_check();}/*** Boolean validation, determines if value passed is a boolean integer or true/false.** @param string $check a valid boolean* @return boolean Success* @access public*/function boolean($check) {$booleanList = array(0, 1, '0', '1', true, false);return in_array($check, $booleanList, true);}/*** Checks that a value is a valid decimal. If $places is null, the $check is allowed to be a scientific float* If no decimal point is found a false will be returned. Both the sign and exponent are optional.** @param integer $check The value the test for decimal* @param integer $places if set $check value must have exactly $places after the decimal point* @param string $regex If a custom regular expression is used this is the only validation that will occur.* @return boolean Success* @access public*/function decimal($check, $places = null, $regex = null) {$_this =& Validation::getInstance();$_this->__reset();$_this->regex = $regex;$_this->check = $check;if (is_null($_this->regex)) {if (is_null($places)) {$_this->regex = '/^[-+]?[0-9]*\\.{1}[0-9]+(?:[eE][-+]?[0-9]+)?$/';} else {$_this->regex = '/^[-+]?[0-9]*\\.{1}[0-9]{'.$places.'}$/';}}return $_this->_check();}/*** Validates for an email address.** @param string $check Value to check* @param boolean $deep Perform a deeper validation (if true), by also checking availability of host* @param string $regex Regex to use (if none it will use built in regex)* @return boolean Success* @access public*/function email($check, $deep = false, $regex = null) {$_this =& Validation::getInstance();$_this->__reset();$_this->check = $check;$_this->regex = $regex;$_this->deep = $deep;if (is_array($check)) {$_this->_extract($check);}if (is_null($_this->regex)) {$_this->regex = '/^[a-z0-9!#$%&\'*+\/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&\'*+\/=?^_`{|}~-]+)*@' . $_this->__pattern['hostname'] . '$/i';}$return = $_this->_check();if ($_this->deep === false || $_this->deep === null) {return $return;}if ($return === true && preg_match('/@(' . $_this->__pattern['hostname'] . ')$/i', $_this->check, $regs)) {$host = gethostbynamel($regs[1]);return is_array($host);}return false;}/*** Check that value is exactly $comparedTo.** @param mixed $check Value to check* @param mixed $comparedTo Value to compare* @return boolean Success* @access public*/function equalTo($check, $comparedTo) {return ($check === $comparedTo);}/*** Check that value has a valid file extension.** @param mixed $check Value to check* @param array $extensions file extenstions to allow* @return boolean Success* @access public*/function extension($check, $extensions = array('gif', 'jpeg', 'png', 'jpg')) {if (is_array($check)) {return Validation::extension(array_shift($check), $extensions);}$extension = strtolower(array_pop(explode('.', $check)));foreach ($extensions as $value) {if ($extension == strtolower($value)) {return true;}}return false;}/*** Check that value is a file name** @param mixed $check Value to check* @access public* @todo finish implementation*/function file($check) {// if (is_array($check)) {// foreach ($check as $value) {// if (!Validation::file($value)) {// return false;// }// }// return true;// }//// return preg_match('/[\w| |_]+\.[\w]+/', $check);}/*** Validation of an IPv4 address.** @param string $check The string to test.* @return boolean Success* @access public*/function ip($check) {$_this =& Validation::getInstance();$_this->check = $check;$_this->regex = '/^' . $_this->__pattern['ip'] . '$/';return $_this->_check();}/*** Checks whether the length of a string is greater or equal to a minimal length.** @param string $check The string to test* @param integer $min The minimal string length* @return boolean Success* @access public*/function minLength($check, $min) {$length = strlen($check);return ($length >= $min);}/*** Checks whether the length of a string is smaller or equal to a maximal length..** @param string $check The string to test* @param integer $max The maximal string length* @return boolean Success* @access public*/function maxLength($check, $max) {$length = strlen($check);return ($length <= $max);}/*** Checks that a value is a monetary amount.** @param string $check Value to check* @param string $symbolPosition Where symbol is located (left/right)* @return boolean Success* @access public*/function money($check, $symbolPosition = 'left') {$_this =& Validation::getInstance();$_this->check = $check;if ($symbolPosition == 'right') {$_this->regex = '/^(?!0,?\d)(?:\d{1,3}(?:([, .])\d{3})?(?:\1\d{3})*|(?:\d+))((?!\1)[,.]\d{2})?(?<!\x{00a2})\p{Sc}?$/u';} else {$_this->regex = '/^(?!\x{00a2})\p{Sc}?(?!0,?\d)(?:\d{1,3}(?:([, .])\d{3})?(?:\1\d{3})*|(?:\d+))((?!\1)[,.]\d{2})?$/u';}return $_this->_check();}/*** Validate a multiple select.** @param mixed $check Value to check* @param mixed $options Options for the check.* Valid options* in => provide a list of choices that selections must be made from* max => maximun number of non-zero choices that can be made* min => minimum number of non-zero choices that can be made* @return boolean Success* @access public*/function multiple($check, $options = array()) {$defaults = array('in' => null, 'max' => null, 'min' => null);$options = array_merge($defaults, $options);$check = array_filter((array)$check);if (empty($check)) {return false;}if ($options['max'] && sizeof($check) > $options['max']) {return false;}if ($options['min'] && sizeof($check) < $options['min']) {return false;}if ($options['in'] && is_array($options['in'])) {foreach ($check as $val) {if (!in_array($val, $options['in'])) {return false;}}}return true;}/*** Checks if a value is numeric.** @param string $check Value to check* @return boolean Succcess* @access public*/function numeric($check) {return is_numeric($check);}/*** Check that a value is a valid phone number.** @param mixed $check Value to check (string or array)* @param string $regex Regular expression to use* @param string $country Country code (defaults to 'all')* @return boolean Success* @access public*/function phone($check, $regex = null, $country = 'all') {$_this =& Validation::getInstance();$_this->check = $check;$_this->regex = $regex;$_this->country = $country;if (is_array($check)) {$_this->_extract($check);}if (is_null($_this->regex)) {switch ($_this->country) {case 'us':// includes all NANPA members. see http://en.wikipedia.org/wiki/North_American_Numbering_Plan#List_of_NANPA_countries_and_territoriesdefault:$_this->regex = '/^(?:\+?1)?[-. ]?\\(?[2-9][0-8][0-9]\\)?[-. ]?[2-9][0-9]{2}[-. ]?[0-9]{4}$/';break;}}return $_this->_check();}/*** Checks that a given value is a valid postal code.** @param mixed $check Value to check* @param string $regex Regular expression to use* @param string $country Country to use for formatting* @return boolean Success* @access public*/function postal($check, $regex = null, $country = null) {$_this =& Validation::getInstance();$_this->check = $check;$_this->regex = $regex;$_this->country = $country;if (is_array($check)) {$_this->_extract($check);}if (is_null($_this->regex)) {switch ($_this->country) {case 'uk':$_this->regex = '/\\A\\b[A-Z]{1,2}[0-9][A-Z0-9]? [0-9][ABD-HJLNP-UW-Z]{2}\\b\\z/i';break;case 'ca':$_this->regex = '/\\A\\b[ABCEGHJKLMNPRSTVXY][0-9][A-Z] [0-9][A-Z][0-9]\\b\\z/i';break;case 'it':case 'de':$_this->regex = '/^[0-9]{5}$/i';break;case 'be':$_this->regex = '/^[1-9]{1}[0-9]{3}$/i';break;case 'us':default:$_this->regex = '/\\A\\b[0-9]{5}(?:-[0-9]{4})?\\b\\z/i';break;}}return $_this->_check();}/*** Validate that a number is in specified range.* if $lower and $upper are not set, will return true if* $check is a legal finite on this platform** @param string $check Value to check* @param integer $lower Lower limit* @param integer $upper Upper limit* @return boolean Success* @access public*/function range($check, $lower = null, $upper = null ) {if (!is_numeric($check)) {return false;}if (isset($lower) && isset($upper)) {return ($check > $lower && $check < $upper);}return is_finite($check);}/*** Checks that a value is a valid Social Security Number.** @param mixed $check Value to check* @param string $regex Regular expression to use* @param string $country Country* @return boolean Success* @access public*/function ssn($check, $regex = null, $country = null) {$_this =& Validation::getInstance();$_this->check = $check;$_this->regex = $regex;$_this->country = $country;if (is_array($check)) {$_this->_extract($check);}if (is_null($_this->regex)) {switch ($_this->country) {case 'dk':$_this->regex = '/\\A\\b[0-9]{6}-[0-9]{4}\\b\\z/i';break;case 'nl':$_this->regex = '/\\A\\b[0-9]{9}\\b\\z/i';break;case 'us':default:$_this->regex = '/\\A\\b[0-9]{3}-[0-9]{2}-[0-9]{4}\\b\\z/i';break;}}return $_this->_check();}/*** Checks that a value is a valid URL according to http://www.w3.org/Addressing/URL/url-spec.txt** The regex checks for the following component parts:* a valid, optional, scheme* a valid ip address OR* a valid domain name as defined by section 2.3.1 of http://www.ietf.org/rfc/rfc1035.txt* with an optional port number* an optional valid path* an optional query string (get parameters)* an optional fragment (anchor tag)** @param string $check Value to check* @return boolean Success* @access public*/function url($check, $strict = false) {$_this =& Validation::getInstance();$_this->check = $check;$validChars = '([' . preg_quote('!"$&\'()*+,-.@_:;=') . '\/0-9a-z]|(%[0-9a-f]{2}))';$_this->regex = '/^(?:(?:https?|ftps?|file|news|gopher):\/\/)' . ife($strict, '', '?') .'(?:' . $_this->__pattern['ip'] . '|' . $_this->__pattern['hostname'] . ')(?::[1-9][0-9]{0,3})?' .'(?:\/?|\/' . $validChars . '*)?' .'(?:\?' . $validChars . '*)?' .'(?:#' . $validChars . '*)?$/i';return $_this->_check();}/*** Checks if a value is in a given list.** @param string $check Value to check* @param array $list List to check against* @return boolean Succcess* @access public*/function inList($check, $list) {return in_array($check, $list);}/*** Runs an user-defined validation.** @param mixed $check value that will be validated in user-defined methods.* @param object $object class that holds validation method* @param string $method class method name for validation to run* @param array $args arguments to send to method* @return mixed user-defined class class method returns* @access public*/function userDefined($check, $object, $method, $args = null) {return call_user_func_array(array(&$object, $method), array($check, $args));}/*** Runs a regular expression match.** @return boolean Success of match* @access protected*/function _check() {$_this =& Validation::getInstance();if (preg_match($_this->regex, $_this->check)) {$_this->error[] = false;return true;} else {$_this->error[] = true;return false;}}/*** Get the values to use when value sent to validation method is* an array.** @param array $params Parameters sent to validation method* @return void* @access protected*/function _extract($params) {$_this =& Validation::getInstance();extract($params, EXTR_OVERWRITE);if (isset($check)) {$_this->check = $check;}if (isset($regex)) {$_this->regex = $regex;}if (isset($country)) {$_this->country = strtolower($country);}if (isset($deep)) {$_this->deep = $deep;}if (isset($type)) {$_this->type = $type;}}/*** Luhn algorithm** @see http://en.wikipedia.org/wiki/Luhn_algorithm* @return boolean Success* @access protected*/function _luhn() {$_this =& Validation::getInstance();if ($_this->deep !== true) {return true;}if ($_this->check == 0) {return false;}$sum = 0;$length = strlen($_this->check);for ($position = 1 - ($length % 2); $position < $length; $position += 2) {$sum += $_this->check[$position];}for ($position = ($length % 2); $position < $length; $position += 2) {$number = $_this->check[$position] * 2;$sum += ($number < 10) ? $number : $number - 9;}return ($sum % 10 == 0);}/*** Reset internal variables for another validation run.** @return void* @access private*/function __reset() {$this->check = null;$this->regex = null;$this->country = null;$this->deep = null;$this->type = null;$this->error = array();$this->errors = array();}}?>