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<?php $var; echo 'before: '; var_dump($var); useRefs($var); echo 'after: '; var_dump($var); useRefs($var); echo 'last: '; var_dump($var); function useRefs(&$var) { if ($var === null) { $var = 'test'; } else { $var = null; } }
Output for git.master, git.master_jit, rfc.property-hooks
before: Warning: Undefined variable $var in /in/8etck on line 4 NULL after: string(4) "test" last: NULL

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