3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(1, 2); $b = array(&$a); $a[] = $b; echo json_last_error(); var_dump(json_encode($a));
based on 43ijV
Output for 5.5.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
0bool(false)
Output for 5.3.0 - 5.4.45
0 Warning: json_encode(): recursion detected in /in/Mjrgc on line 9 string(18) "[1,2,[[1,2,null]]]"
Output for 5.0.0 - 5.2.17
Fatal error: Call to undefined function json_last_error() in /in/Mjrgc on line 7
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_last_error() in /in/Mjrgc on line 7
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_last_error() in /in/Mjrgc on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_last_error() in /in/Mjrgc on line 7