3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $json = json_encode(array(foo => bar)); echo $json;
Output for 7.2.0 - 7.2.6
Warning: Use of undefined constant foo - assumed 'foo' (this will throw an Error in a future version of PHP) in /in/Yb7aU on line 3 Warning: Use of undefined constant bar - assumed 'bar' (this will throw an Error in a future version of PHP) in /in/Yb7aU on line 3 {"foo":"bar"}
Output for 5.2.0 - 7.1.20
Notice: Use of undefined constant foo - assumed 'foo' in /in/Yb7aU on line 3 Notice: Use of undefined constant bar - assumed 'bar' in /in/Yb7aU on line 3 {"foo":"bar"}
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/Yb7aU on line 3
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/Yb7aU on line 3
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/Yb7aU on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/Yb7aU on line 3