A faster way to replace the strings in multidimensional array is to json_encode() it, do the str_replace() and then json_decode() it, like this:  <?php  function  str_replace_json ( $search ,  $replace ,  $subject ){      return  json_decode ( str_replace ( $search ,  $replace ,   json_encode ( $subject ))); }  ?>  This method is almost 3x faster (in 10000 runs.) than using recursive calling and looping method, and 10x simpler in coding.  Compared to:  <?php  function  str_replace_deep ( $search ,  $replace ,  $subject ) {     if ( is_array ( $subject ))     {         foreach( $subject  as & $oneSubject )              $oneSubject  =  str_replace_deep ( $search ,  $replace ,  $oneSubject );         unset( $oneSubject );         return  $subject ;     } else {         return  str_replace ( $search ,  $replace ,  $subject );     } }  ?>