3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php class foo { function __construct() { $this->a = "hello"; $this->b = "hi"; $this->val = "howdy"; $val = a; echo $val; // outputs "hello" echo "\n"; $val = "b"; echo $this->{$val}; // outputs "hi" echo "\n"; echo $this->val; //outputs "howdy" echo "\n"; echo $this->{"val"}; } } $foo = new foo();
based on nfUA8
Output for 5.0.0 - 7.1.0
Notice: Use of undefined constant a - assumed 'a' in /in/ZJBSZ on line 9 a hi howdy howdy
Output for 4.3.0 - 4.4.9