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<?php $a = array_fill_keys(array('a', 'b', 'c'), array()); $a['a'][] = 1; var_dump($a);
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { ["a"]=> array(1) { [0]=> int(1) } ["b"]=> array(0) { } ["c"]=> array(0) { } }

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