3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function f($a) { $b = $b*a; if ($a > 0) { $b = f($a-1); } return $b; } echo f(1);
Output for 7.2.0
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/80Svg on line 3 Notice: Undefined variable: b in /in/80Svg on line 3 Warning: A non-numeric value encountered in /in/80Svg on line 3 Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/80Svg on line 3 Notice: Undefined variable: b in /in/80Svg on line 3 Warning: A non-numeric value encountered in /in/80Svg on line 3 0
Output for 7.1.0 - 7.1.10
Notice: Use of undefined constant a - assumed 'a' in /in/80Svg on line 3 Notice: Undefined variable: b in /in/80Svg on line 3 Warning: A non-numeric value encountered in /in/80Svg on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/80Svg on line 3 Notice: Undefined variable: b in /in/80Svg on line 3 Warning: A non-numeric value encountered in /in/80Svg on line 3 0
Output for 5.1.0 - 7.0.20
Notice: Use of undefined constant a - assumed 'a' in /in/80Svg on line 3 Notice: Undefined variable: b in /in/80Svg on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/80Svg on line 3 Notice: Undefined variable: b in /in/80Svg on line 3 0
Output for 5.0.4 - 5.0.5
Notice: Undefined variable: b in /in/80Svg on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/80Svg on line 3 Notice: Undefined variable: b in /in/80Svg on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/80Svg on line 3 0
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: b in /in/80Svg on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/80Svg on line 3 Notice: Undefined variable: b in /in/80Svg on line 3 Notice: Use of undefined constant a - assumed 'a' in /in/80Svg on line 3 0