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<?php $config = []; $foo = is_callable($config['callable']); $config['callable'] = 'nonexistent_callable'; $bar = is_callable($config['callable']); $config['callable'] = 'strtolower'; $baz = is_callable($config['callable']);
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "callable" in /in/iTlfC on line 3

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