Bug #75914 [Opn->Nab]: Memory leak when anonymous function is assigned to the class variable

Edit report at https://bugs.php.net/bug.php?id=75914&edit=1 ID: 75914 Updated by: kelunik@php.net Reported by: john357smith at gmail dot com Summary: Memory leak when anonymous function is assigned to the class variable -Status: Open +Status: Not a bug Type: Bug Package: Performance problem Operating System: Linux PHP Version: 7.2.2 Block user comment: N Private report: N New Comment: There's no leak. You're creating a circular reference there. If you use gc_collect_cycles(), everything is fine. If you remove the usleep(), you'll see that it runs totally fine even without gc_collect_cycles(). It just takes its time until the GC kicks in. Previous Comments: ------------------------------------------------------------------------ [2018-02-04 14:04:22] john357smith at gmail dot com Description: ------------ In case an anonymous function is assigned to the class variable (doesn't matter if public, private or protected) and a new class instance is created a memory is not freed at the end. To correctly free memory you have to set a class variable to null or call a garbage collector manually. See test script. Test script: --------------- class TestMem { public $class_var = null; public function __construct() { $this->class_var = function() { }; } } while (true) { $frame = new TestMem(); //$frame->class_var = null; //echo(gc_collect_cycles()."\n"); echo(memory_get_usage()."\n"); usleep(10000); } Expected result: ---------------- A memory usage is still on the same level. Actual result: -------------- A memory usage is constantly increasing. ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=75914&edit=1