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run code in 200+ php & hhvm versions
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<?php $string = 'bal'; var_dump($string['servers']); var_dump(intval('servers')); var_dump(isset($string['servers']));
based on m1tmB
Output for 5.4.0 - 7.2.0
Warning: Illegal string offset 'servers' in /in/iOfIf on line 4 string(1) "b" int(0) bool(false)
Output for 4.3.0 - 4.4.9, 5.0.3 - 5.3.29
string(1) "b" int(0) bool(true)
Output for 5.0.0 - 5.0.2
string(1) "b" int(0) bool(false)