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<?php $foo = function (int &$bar) { $bar++; }; $baz = 0; $args = [$baz]; call_user_func_array($foo, $args); echo $args[0]; call_user_func_array($foo, $args); echo $args[0]; $foo($args[0]); echo $args[0]; call_user_func_array($foo, $args); echo $args[0]; call_user_func_array($foo, $args); echo $args[0];
Output for git.master, git.master_jit, rfc.property-hooks
Warning: {closure}(): Argument #1 ($bar) must be passed by reference, value given in /in/Ro4Mn on line 7 0 Warning: {closure}(): Argument #1 ($bar) must be passed by reference, value given in /in/Ro4Mn on line 10 0123

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