Bug #52487 [Opn->Csd]: PDO::FETCH_INTO leaks memory

Edit report at http://bugs.php.net/bug.php?id=52487&edit=1 ID: 52487 Updated by: felipe@php.net Reported by: marques at displague dot com Summary: PDO::FETCH_INTO leaks memory -Status: Open +Status: Closed Type: Bug Package: PDO related PHP Version: 5.3.3 -Assigned To: +Assigned To: felipe Block user comment: N New Comment: This bug has been fixed in SVN. Snapshots of the sources are packaged every three hours; this change will be in the next snapshot. You can grab the snapshot at http://snaps.php.net/. Thank you for the report, and for helping us make PHP better. Previous Comments: ------------------------------------------------------------------------ [2010-07-30 01:38:56] felipe@php.net Automatic comment from SVN on behalf of felipe Revision: http://svn.php.net/viewvc/?view=revision&amp;revision=301706 Log: - Fixed bug #52487 (PDO::FETCH_INTO leaks memory) ------------------------------------------------------------------------ [2010-07-29 15:47:03] marques at displague dot com Description: ------------ When assigning an object to a PDO statement via FETCH_INTO a memory leak occurs that can not be corrected through php code. A subsequent FETCH_INTO with a different object only furthers the problem. Changing the fetch mode, unsetting the statement, closing the cursor, and calling the garbage collection do not free the memory either. This bug exists in 5.2 and 5.3. Test script: --------------- <?php if (! extension_loaded('pdo_sqlite')) { dl('pdo_sqlite.so'); } $pdo = new PDO('sqlite::memory:'); echo "Start mem:".memory_get_peak_usage()."\n"; // Simple test $stmt = $pdo->prepare("select 1 as attr"); for($i=0; $i<100000; $i++) { $stmt->setFetchMode(PDO::FETCH_INTO, new StdClass); echo "mem: ".memory_get_usage()."\n"; } // End - Simple Test // Alternate test with failed remedies class test { public $attr; public function load($pdo) { $stmt = $pdo->prepare("select 1 as attr"); //$stmt->setFetchMode(PDO::FETCH_INTO, $this); // This leaks quickly $stmt->setFetchMode(PDO::FETCH_INTO, new StdClass); // This still leaks $stmt->setFetchMode(PDO::FETCH_ASSOC); // You might think this would fix the leak - no effect $stmt->closeCursor(); // No effect unset($stmt); // No effect } } for($i=0; $i<100000; $i++) { $test = new test; $test->load($pdo); if (function_exists('gc_collect_cycles')) { echo "+gc+ "; gc_collect_cycles(); // No effect } unset($test); echo "mem: ".memory_get_peak_usage()."\n"; } Expected result: ---------------- I would expect the peak memory usage to remain consisten on subsequent iterations. Actual result: -------------- The peak memory usage continues to rise until the php memory limit is hit. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=52487&edit=1