3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo http_build_query(['a'=>1, 'b'=>2]);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
a=1&b=2
preferences:
162.59 ms | 403 KiB | 189 Q