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<?php function foo($s) { return strtoupper(trim($s)); } function bar($s) { $s = trim($s); $s = strtoupper($s); return $s; } $x = " Hello! "; var_dump(foo($x)); var_dump(bar($x));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
string(6) "HELLO!" string(6) "HELLO!"