3v4l.org

run code in 300+ PHP versions simultaneously
<?php $checkme = ''; json_decode($checkme); if (json_last_error() === JSON_ERROR_NONE){ echo "No error."; }else{ echo "error detected of : " . json_last_error() . " " . json_last_error_msg(); }
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
error detected of : 4 Syntax error

preferences:
144.9 ms | 403 KiB | 181 Q