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<?php $zero = 0; $null = NULL; var_dump(!isset($zero)); var_dump(!isset($null)); var_dump(empty($zero)); var_dump(empty($null)); var_dump(is_null($zero)); var_dump(is_null($null));
Output for git.master, git.master_jit, rfc.property-hooks
bool(false) bool(true) bool(true) bool(true) bool(false) bool(true)

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