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<?php function increment(&$var) { echo 'Variable with value '.$var.' has been passed.'.PHP_EOL; $var++; } $a = 1; call_user_func_array('increment', [$a]); echo $a."\n";
Output for git.master, git.master_jit, rfc.property-hooks
Warning: increment(): Argument #1 ($var) must be passed by reference, value given in /in/erHl3 on line 10 Variable with value 1 has been passed. 1

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