Bug #65300 [Opn->Nab]: Memory leak when initializing objects

Edit report at https://bugs.php.net/bug.php?id=65300&edit=1 ID: 65300 Updated by: johannes@php.net Reported by: zlobnygrif at gmail dot com Summary: Memory leak when initializing objects -Status: Open +Status: Not a bug Type: Bug Package: *General Issues Operating System: debian/ubuntu PHP Version: 5.4.17 Block user comment: N Private report: N New Comment: Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php When creating the class we "prefill" the properties. Thanks to copy-on-write we (generally) don't have to copy these values when creating an instance of the object. When reassigning them with the same value those default values will e replaced. We don't compare the values. Previous Comments: ------------------------------------------------------------------------ [2013-07-20 06:14:03] zlobnygrif at gmail dot com Description: ------------ If I set object property run-time it uses more memory than equal default property value. Test script: --------------- printf("PHP %s %s\n\n", PHP_VERSION, PHP_OS); class Order { public $id = '123'; public $number = '1234'; public $date = '12345'; } $orders = []; printf("Test1\nMem before: %.2f mb\n", memory_get_usage(true) / 1024 / 1024); for ( $i = 0; ++$i < 100000; ) { $order = new Order; $orders[] = $order; } printf("Mem after: %.2f mb\n\n", memory_get_usage(true) / 1024 / 1024); unset($orders, $i); $orders = []; printf("Test2\nMem before: %.2f mb\n", memory_get_usage(true) / 1024 / 1024); for ( $i = 0; ++$i < 100000; ) { $order = new Order; $orders[] = $order; } printf("Mem after: %.2f mb\n\n", memory_get_usage(true) / 1024 / 1024); unset($orders, $i); $orders = []; printf("Test3\nMem before: %.2f mb\n", memory_get_usage(true) / 1024 / 1024); for ( $i = 0; ++$i < 100000; ) { $order = new Order; $order->id = '123'; $order->number = '12345'; $order->date = '123456'; $orders[] = $order; } printf("Mem after: %.2f mb\n\n", memory_get_usage(true) / 1024 / 1024); unset($orders, $i); printf("Mem after: %.2f mb\n\n", memory_get_usage(true) / 1024 / 1024); Expected result: ---------------- no memory leaks Actual result: -------------- PHP 5.4.17-1~dotdeb.0 Linux Test1 Mem before: 0.25 mb Mem after: 16.25 mb Test2 Mem before: 4.75 mb Mem after: 16.25 mb Test3 Mem before: 5.00 mb Mem after: 24.25 mb Mem after: 5.25 mb ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=65300&edit=1