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<?php $obj = (object)[ "foo" => "bar", "bar" => "foo", ]; print_r($obj); echo array_keys($obj);
Output for git.master, git.master_jit, rfc.property-hooks
stdClass Object ( [foo] => bar [bar] => foo ) Fatal error: Uncaught TypeError: array_keys(): Argument #1 ($array) must be of type array, stdClass given in /in/We3tE:9 Stack trace: #0 /in/We3tE(9): array_keys(Object(stdClass)) #1 {main} thrown in /in/We3tE on line 9
Process exited with code 255.

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