Description:
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I have this function which runs well on Php 4.9 :

function lire_structure($inlist_stru,$link) {
	if ($inlist_stru=='') return '';
	$stmt = OCIParse($link,"select STRU_ID,STRU_MOLFILE from sub_structure_view where stru_id in(".$inlist_stru.")");
	OCIExecute($stmt);
	while (OCIFetchInto ($stmt, $row, OCI_RETURN_LOBS)) {
		$i++;
		$tabstru[$row[0]]=$row[1];
		//echo "$i<br>";
	}
	return $tabstru;
}


But when I used it on php 5.2.9 :

I have this following error :
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 524288 bytes)

So I change the memory limit of php.ini from 128 M to 512 (256 m is not enough) and the function works well.
But I'm asking why with php 4.9 where the memory limit of php.ini is only at 8 M, the function works well?

I see in internet forum that php 5 releases memory no correctly.
Could you help me?

Actual result:
--------------
I have this following error :
Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 524288 bytes)