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<?php function passByReference(&$test) { $test = "Changed!"; } function passByValue($test) { $test = "a change here will not affect the original variable"; } $test = 'Unchanged'; echo $test . PHP_EOL; passByValue($test); echo $test . PHP_EOL; passByReference($test); echo $test . PHP_EOL;
Output for git.master, git.master_jit, rfc.property-hooks
Unchanged Unchanged Changed!

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