3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(round(4503599627370495.5));
Output for 8.4.1 - 8.4.4
float(4503599627370496)
Output for 8.1.0 - 8.1.31, 8.2.0 - 8.2.27, 8.3.0 - 8.3.17
float(4503599627370495.5)
preferences:
67.28 ms | 407 KiB | 5 Q