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<?php $arr = []; $arr[null] = 1; var_dump($arr); $arr = []; $arr[''] = 1; var_dump($arr);
Output for git.master, git.master_jit
Deprecated: Using null as an array offset is deprecated, use an empty string instead in /in/5TTAO on line 4 array(1) { [""]=> int(1) } array(1) { [""]=> int(1) }

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