Description:
------------
---
From manual page: http://www.php.net/function.preg-grep
---


Test script:
---------------
$var = ucfirst ($_REQUEST['queryString']);
$friends_inner=$_SESSION['friends'];
for($i=0; $i<sizeof($friends_inner); $i++)
{
$selected_friend=$friends_inner[$i];
$selected_friend_id=$selected_friend['id']; //array of ids
$selected_friend_name=$selected_friend['name']; // array of names
$name[$i]=$selected_friend_name;
}
$result=preg_grep('/^'.$var.'.*/', $name);
(to be note)
this will show different result
echo "total elements in matched array name = ".count($result)."<br>";

$final_result=array();
$maxindex = array_pop(array_keys($result));
for($i=0;$i<=$maxindex;$i++){                 //returns array that start with zero
	if(isset($result[$i])){
	array_push($final_result,$result[$i]);
		          }
		 }
$ids_of_result=array();	
function sort_arrays($final_result,$friends_inner) {
	$ids_of_result = array();
	foreach($final_result as $fnl_rslt){
		foreach($friends_inner as $frnd_in){
			if($fnl_rslt == $frnd_in['name']){
				//echo 'Name : '.$frnd_in['name'].'<br>';
				//echo 'Id : '.$frnd_in['id'].'<br>';
				array_push($ids_of_result,$frnd_in['id']); 
			}
		}
	}
	return $ids_of_result;
}
$ids_of_result = sort_arrays($final_result,$friends_inner);	
(to be note)
this will  show different result
echo "total elements in match array ids =  ".count($ids_of_result)."<br>";