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<?php $x = []; if ($x instanceof ArrayObject || $x instanceof ArrayAccess || $x instanceof Countable) { echo 'yes'; } else { echo 'no'; } $x = new ArrayObject; function foo(array $a) { echo 'k'; } foo($x);
Output for git.master, git.master_jit, rfc.property-hooks
no Fatal error: Uncaught TypeError: foo(): Argument #1 ($a) must be of type array, ArrayObject given, called in /in/4pcIn on line 16 and defined in /in/4pcIn:12 Stack trace: #0 /in/4pcIn(16): foo(Object(ArrayObject)) #1 {main} thrown in /in/4pcIn on line 12
Process exited with code 255.

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