3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php json_encode($_SESSION['hi'], JSON_HEX_TAG);
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined variable: _SESSION in /in/qaH6E on line 1
Output for hhvm-3.10.0 - 3.12.0
Notice: Undefined index: hi in /in/qaH6E on line 1
Output for 5.2.0 - 5.2.17
Notice: Undefined variable: _SESSION in /in/qaH6E on line 1 Notice: Use of undefined constant JSON_HEX_TAG - assumed 'JSON_HEX_TAG' in /in/qaH6E on line 1 Warning: json_encode() expects exactly 1 parameter, 2 given in /in/qaH6E on line 1
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/qaH6E on line 1
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/qaH6E on line 1
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/qaH6E on line 1
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/qaH6E on line 1