3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = (int)2 ** 63 -1; $b = 0x7FFFFFFFFFFFFFFF; var_dump(($a == $b) === true); var_dump((int)2 ** 63 -1); // -9.2233720368548E+18 var_dump((float) 0x7FFFFFFFFFFFFFFF); // 9223372036854775807 var_dump((0x7FFFFFFFFFFFFFFF == (2 ** 63 -1)) === true); // 9223372036854775807 === -9223372036854800000 // sure why not
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
bool(false) float(-9.223372036854776E+18) float(9.223372036854776E+18) bool(true)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 bool(false) float(-9.223372036854776E+18) float(9.223372036854776E+18) bool(true)
Output for 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
bool(false) float(-9.2233720368548E+18) float(9.2233720368548E+18) bool(true)
preferences:
145.79 ms | 402 KiB | 158 Q