3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $index_norm = array("key1" => "foobar", "key2" => "bananaramam", "key3" => "spam"); $result = array( "ids"=>array_keys($index_norm), "weights"=>array_values($index_norm) ); echo json_encode($result);
Output for 5.2.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
{"ids":["key1","key2","key3"],"weights":["foobar","bananaramam","spam"]}
Output for 5.0.0 - 5.1.6
Fatal error: Call to undefined function json_encode() in /in/CS7tp 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/CS7tp 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/CS7tp 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/CS7tp on line 9