3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = []; $innerkeyArray = ['{"Hello":"Chintan"}']; $array[$innerkeyArray] = ''; print_r($array);
based on He8Di
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0alpha1
Warning: Illegal offset type in /in/UNrcW on line 5 Array ( )