undefined offset .. when moved to php 4.3

[phprock]

Hi I just update my php version and i get this error "Undefined offset: 1060 in" like $final .= $temp[$i].$matches[0][$i];

function  changekey($str)
{

$final="";
  $data = preg_split('#(<\/?)(\w+)([^>]*>)#mis',$str);
	    preg_match_all('#(<\/?)(\w+)([^>]*>)#mis',$str,$matches);
	    $temp = array();
	    foreach($data as $text){
	        $temp[] = strtr($text,$array);
	    }
	    for($i=0;$i<sizeof($temp);$i++){
	        $final .= $temp[$i].$matches[0][$i];


}

Any help