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<?php $test = array_fill_keys(array('a', 'b'), array()); $test['a'][] = 1; var_dump($test); ?>
Output for 5.2.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
array(2) { ["a"]=> array(1) { [0]=> int(1) } ["b"]=> array(0) { } }
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function array_fill_keys() in /in/ZM5pI on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: array_fill_keys() in /in/ZM5pI on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: array_fill_keys() in /in/ZM5pI on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: array_fill_keys() in /in/ZM5pI on line 2