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run code in 300+ PHP versions simultaneously
<?php function foo(&$bar) { var_dump($bar); } $z = new stdclass; call_user_func("foo", array($z));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: foo(): Argument #1 ($bar) must be passed by reference, value given in /in/mr3DN on line 4 array(1) { [0]=> object(stdClass)#1 (0) { } }
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Parameter 1 to foo() expected to be a reference, value given in /in/mr3DN on line 4 array(1) { [0]=> object(stdClass)#1 (0) { } }
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20
array(1) { [0]=> object(stdClass)#1 (0) { } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
array(1) { [0]=> object(stdClass)(0) { } }

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