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<?php $array = [[1], [2], [3]]; function foo(){ echo 'called'.PHP_EOL; return 1; } foreach ($array as [foo() => &$val]) { var_dump($val); } var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
called NULL called NULL called NULL array(3) { [0]=> array(2) { [0]=> int(1) [1]=> NULL } [1]=> array(2) { [0]=> int(2) [1]=> NULL } [2]=> array(2) { [0]=> int(3) [1]=> &NULL } }

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