foreach

<?php

/*Input: mang ds.
* Output: In dam nguoi co ID == "lop truong"
*/
    $ds = array("Lam","lop truong" => "Xon", "oanh", "xup lo");

    foreach( $ds as $key => $name)
    {
        if($key == "lop truong")
            echo "<b>".$name."</b>";
        else
            echo $name;

        echo "<br />";
    }

?>