3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(E_ALL & ~E_WARNING); session_start(); session_destroy(); ini_set("session.hash_bits_per_character", 6); ini_set("session.hash_function", 1); session_start(); var_dump(session_id()); session_destroy(); ini_set("session.hash_bits_per_character", 5); ini_set("session.hash_function", 1); session_start(); var_dump(session_id()); session_destroy(); ini_set("session.hash_bits_per_character", 4); ini_set("session.hash_function", 1); session_start(); var_dump(session_id()); session_destroy();

preferences:
38.13 ms | 402 KiB | 5 Q