3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = array( '4' => 1, '3' => 2, '2' => '3', '1' => '4', ); $str = json_encode($arr); var_dump($str);
based on pPNvE
Output for 5.2.0 - 7.2.0
string(29) "{"4":1,"3":2,"2":"3","1":"4"}"
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/V8LAg on line 9
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/V8LAg on line 9
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/V8LAg on line 9
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/V8LAg on line 9