3v4l.org

run code in 300+ PHP versions simultaneously
<?php function isJson($string) { $decoded = json_decode($string); return (json_last_error() == JSON_ERROR_NONE); } if ( isJson(123) ) { echo "valid JSON"; } else { echo "not valid JSON"; }
Output for git.master, git.master_jit, rfc.property-hooks
valid JSON

This tab shows result from various feature-branches currently under review by the php developers. Contact me to have additional branches featured.

Active branches

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page

preferences:
28.22 ms | 405 KiB | 5 Q