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<?php $a = array('xml' => array( 'attributes' => array( 'version' => '1.0', 'encoding' => 'utf-8', ), )); var_dump(array_merge($a['attributes'], array('test' => 'my_test_123')));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "attributes" in /in/NCmIo on line 8 Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/NCmIo:8 Stack trace: #0 /in/NCmIo(8): array_merge(NULL, Array) #1 {main} thrown in /in/NCmIo on line 8
Process exited with code 255.

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