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<?php $k = array_key_first([]); $arr[$k] = 1; var_dump($arr);
Output for git.master_jit, git.master
Deprecated: Using null as an array offset is deprecated, use an empty string instead in /in/W3QKm on line 4 array(1) { [""]=> int(1) }
Output for rfc.property-hooks
array(1) { [""]=> int(1) }

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