The following script :
<?
function srv_isin($array, $pattern) {
  foreach ($array as $current)
    return;
} //srv_isin

srv_isin(array("meuh"), "meuh");
?>

produces :
15:18 [webase3:pts/11] salome:~/html% php test.php 
Content-Type: text/html

test.php:  Freeing 0x018FF2E8 (4 bytes), allocated in zend_hash.c on line 391<br>
test.php:  Freeing 0x018FF298 (35 bytes), allocated in zend_hash.c on line 380<br>
test.php:  Freeing 0x018FF258 (20 bytes), allocated in zend_hash.c on line 95<br>
test.php:  Freeing 0x018FF200 (44 bytes), allocated in zend_variables.c on line 131<br>