3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $a['question'] = array(); $a['question'][1] = array('test'=>1, 'blah'=>'cool'); echo json_encode($a);
based on 3i4ME
Output for 5.2.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
{"question":{"1":{"test":1,"blah":"cool"}}}
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/6hLEL on line 5
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/6hLEL on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/6hLEL on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/6hLEL on line 5