3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(serialize((float)214748364899999999));
Output for 5.6.28, 7.0.20, 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
string(18) "d:2.147483649E+17;"
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.6
string(21) "d:214748364900000000;"

preferences:
195.12 ms | 402 KiB | 253 Q