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<?php function test($a) { if (!is_array($a) && !($a instanceof \Traversable)) { throw new \Exception("here"); } return implode(' ', $a); } $traversable = new ArrayObject(); $traversable['test'] = 'that'; echo test(['a', 'b', 'c']); echo test($traversable);
Output for git.master, git.master_jit, rfc.property-hooks
a b c Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, ArrayObject given in /in/1413t:7 Stack trace: #0 /in/1413t(7): implode(' ', Object(ArrayObject)) #1 /in/1413t(13): test(Object(ArrayObject)) #2 {main} thrown in /in/1413t on line 7
Process exited with code 255.

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