3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo json_encode(array(12 => 12), 0, 8);
Output for 5.5.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
{"12":12}
Output for 5.3.0 - 5.4.45
Warning: json_encode() expects at most 2 parameters, 3 given in /in/3vQSX on line 2
Output for 5.2.0 - 5.2.17
Warning: json_encode() expects exactly 1 parameter, 3 given in /in/3vQSX on line 2
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/3vQSX on line 2
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/3vQSX on line 2
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/3vQSX on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/3vQSX on line 2