3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $a[0] =& $a; var_dump( json_encode( $a, 0, -1 ) ); var_dump( json_last_error() ); var_dump( json_encode( $a, 0, 0 ) ); var_dump( json_last_error() ); var_dump( json_encode( $a, 0, 1 ) ); var_dump( json_last_error() ); var_dump( json_encode( $a, 0, 2 ) ); var_dump( json_last_error() ); var_dump( json_encode( $a, 0, 3 ) ); var_dump( json_last_error() );
Output for 7.1.0
bool(false) int(6) bool(false) int(6) bool(false) int(6) bool(false) int(6) bool(false) int(6)
Output for 5.5.0 - 7.0.14
bool(false) int(1) bool(false) int(1) bool(false) int(1) bool(false) int(6) bool(false) int(6)
Output for 5.3.0 - 5.4.45
Warning: json_encode() expects at most 2 parameters, 3 given in /in/aNO8j on line 6 NULL int(0) Warning: json_encode() expects at most 2 parameters, 3 given in /in/aNO8j on line 8 NULL int(0) Warning: json_encode() expects at most 2 parameters, 3 given in /in/aNO8j on line 10 NULL int(0) Warning: json_encode() expects at most 2 parameters, 3 given in /in/aNO8j on line 12 NULL int(0) Warning: json_encode() expects at most 2 parameters, 3 given in /in/aNO8j on line 14 NULL int(0)
Output for 5.2.0 - 5.2.17
Warning: json_encode() expects exactly 1 parameter, 3 given in /in/aNO8j on line 6 NULL Fatal error: Call to undefined function json_last_error() in /in/aNO8j on line 7
Process exited with code 255.
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/aNO8j on line 6
Process exited with code 255.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: json_encode() in /in/aNO8j on line 6
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: json_encode() in /in/aNO8j on line 6
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: json_encode() in /in/aNO8j on line 6