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Bugs & Features
<?php $foo = new stdclass; $foo->pdo = new stdclass; $bar = $foo; var_dump($bar,$foo); $foo = null; var_dump($bar,$foo);
Output for 5.0.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
object(stdClass)#1 (1) { ["pdo"]=> object(stdClass)#2 (0) { } } object(stdClass)#1 (1) { ["pdo"]=> object(stdClass)#2 (0) { } } object(stdClass)#1 (1) { ["pdo"]=> object(stdClass)#2 (0) { } } NULL
Output for 4.3.0 - 4.4.9
object(stdClass)(1) { ["pdo"]=> object(stdClass)(0) { } } object(stdClass)(1) { ["pdo"]=> object(stdClass)(0) { } } object(stdClass)(1) { ["pdo"]=> object(stdClass)(0) { } } NULL