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<?php $a = array('ttt' => 45);$s = 'lorem';var_dump(isset($a['ttt']), isset($s['ttt']), $a['ttt'], $s['ttt']);
Output for 5.4.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: Illegal string offset 'ttt' in /in/Xs862 on line 2 bool(true) bool(false) int(45) string(1) "l"
Output for 5.0.0 - 5.0.2, hhvm-3.10.0 - 3.12.0
bool(true) bool(false) int(45) string(1) "l"
Output for 4.3.0 - 4.4.9, 5.0.3 - 5.3.29
bool(true) bool(true) int(45) string(1) "l"