3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(ini_get('session.name')); var_dump(session_name("foo"));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
string(9) "PHPSESSID" Warning: session_name(): Session name cannot be changed after headers have already been sent in /in/dUT7W on line 5 bool(false)
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
string(9) "PHPSESSID" Warning: session_name(): Cannot change session name when headers already sent in /in/dUT7W on line 5 bool(false)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
string(9) "PHPSESSID" string(9) "PHPSESSID"

preferences:
288.36 ms | 404 KiB | 456 Q