PHP : CDate

// CDate.php

class CDate {
    
    function str2time($strStr, $strPattern)
    {
        

       // an array of the valide date characters, see: http://php.net/date#AEN21898
       $arrCharacters = array(
           'd', // day
           'm', // month
           'y', // year, 2 digits
           'Y', // year, 4 digits
           'H', // hours
           'i', // minutes
           's'  // seconds
       );
       // transform the characters array to a string
       $strCharacters = implode('', $arrCharacters);


    
       // splits up the pattern by the date characters to get an array of the delimiters between the date characters
       $arrDelimiters = preg_split('~['.$strCharacters.']~', $strPattern);

       // transform the delimiters array to a string
       $strDelimiters = quotemeta(implode('', array_unique($arrDelimiters)));


    
       // splits up the date by the delimiters to get an array of the declaration
       $arrStr    = preg_split('~[' . $strDelimiters . ']~' , $strStr);
    

       // splits up the pattern by the delimiters to get an array of the used characters
       $arrPattern = preg_split('~['.$strDelimiters.']~', $strPattern);
    
        
       // if the numbers of the two array are not the same, return false, because the cannot belong together
       if (count($arrStr) !== count($arrPattern)) {
           return false;
       }
    
       // creates a new array which has the keys from the $arrPattern array and the values from the $arrStr array
       $arrTime = array();
       for ($i = 0;$i < count($arrStr);$i++) {
           $arrTime[$arrPattern[$i]] = $arrStr[$i];
       }
    
            
       // gernerates a 4 digit year declaration of a 2 digit one by using the current year
       if (isset($arrTime['y']) && !isset($arrTime['Y'])) {
           $arrTime['Y'] = substr(date('Y'), 0, 2) . $arrTime['y'];
       }
    
    
       // if a declaration is empty, it will be filled with the current date declaration
       foreach ($arrCharacters as $strCharacter) {
           if (empty($arrTime[$strCharacter])) {
               $arrTime[$strCharacter] = date($strCharacter);
           }
       }
    
    
       // checks if the date is a valide date
       if (!checkdate($arrTime['m'], $arrTime['d'], $arrTime['Y'])) {
           return false;
       }
    
       // generates the timestamp
       $intTime = mktime($arrTime['H'], $arrTime['i'], $arrTime['s'], $arrTime['m'], $arrTime['d'], $arrTime['Y']);
       // returns the timestamp
    
       return $intTime;
    } // end function str2time
    
}// end class CDate

雖然現在很少人在寫PHP用手動比對時間, 通常都交給SQL去驗證.