<?php function foo(&$str) { $str = 'xyz'; return $str; } $o = "abc"; foo($o); var_dump($o); $o = "abc"; call_user_func('foo', $o); var_dump($o); $o = "abc"; call_user_func('foo', [$o]); var_dump($o); $a[] = "abc"; $a[] = "abc"; $a[] = "abc"; call_user_func('foo', array_slice($a, 0, 1)); var_dump($a);
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