Validate a date format [DD/MM/YYYY, MM-DD-YYYY]

<?php 
     /** 
     * 
     * Validate a date 
     * 
     * @param     string     $date 
     * @param     string     format 
     * @return     bool 
     * 
     */ 
     function validateDate( $date, $format='YYYY-MM-DD') 
     { 
          switch( $format ) 
          { 
               case 'YYYY/MM/DD': 
               case 'YYYY-MM-DD': 
               list( $y, $m, $d ) = preg_split( '/[-./ ]/', $date ); 
               break; 

               case 'YYYY/DD/MM': 
               case 'YYYY-DD-MM': 
               list( $y, $d, $m ) = preg_split( '/[-./ ]/', $date ); 
               break; 

               case 'DD-MM-YYYY': 
               case 'DD/MM/YYYY': 
               list( $d, $m, $y ) = preg_split( '/[-./ ]/', $date ); 
               break; 

               case 'MM-DD-YYYY': 
               case 'MM/DD/YYYY': 
               list( $m, $d, $y ) = preg_split( '/[-./ ]/', $date ); 
               break; 

               case 'YYYYMMDD': 
               $y = substr( $date, 0, 4 ); 
               $m = substr( $date, 4, 2 ); 
               $d = substr( $date, 6, 2 ); 
               break; 

               case 'YYYYDDMM': 
               $y = substr( $date, 0, 4 ); 
               $d = substr( $date, 4, 2 ); 
               $m = substr( $date, 6, 2 ); 
               break; 

               default: 
               throw new Exception( "Invalid Date Format" ); 
          } 
          return checkdate( $m, $d, $y ); 
     } 
?>