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 $this->{$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();
Output for 5.0.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
hello hi howdy howdy
Output for hhvm-3.14.4
Uncaught exception: std::bad_alloc
Process exited with code 255.
Output for 4.3.0 - 4.4.9