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<?php $testArray = array('test' => array('a' => array('percy', 'a' => 'mitch'), 'b', 'c')); $res = array_column('a', $testArray); print_r($res);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: array_column(): Argument #1 ($array) must be of type array, string given in /in/s1i5n:5 Stack trace: #0 /in/s1i5n(5): array_column('a', Array) #1 {main} thrown in /in/s1i5n on line 5
Process exited with code 255.

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