<?php
    function filter($var){
        	if ($var == 'jeruk') {
        	return($var);
        	}
    }
   $buah=array("melon","semangka","nangka","jeruk","jeruk");
   print_r(array_filter($buah,"filter"));
?>

#HASIL RUNNING
Array ( [3] => jeruk [4] => jeruk )