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<?php $v = 18; function f( &$p ) { $p = 36; return $p; } echo call_user_func('f', $v); // error: expecting reference variable
Output for git.master, git.master_jit, rfc.property-hooks
Warning: f(): Argument #1 ($p) must be passed by reference, value given in /in/Ba7qZ on line 7 36

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