3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo pow(2,53)-1; echo "\n",PHP_INT_MAX,"\n"; var_dump(PHP_INT_MAX + (PHP_INT_MAX/2) );
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
9007199254740991 9223372036854775807 float(1.3835058055282164E+19)
Output for 4.4.0 - 4.4.9, 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, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
9007199254740991 9223372036854775807 float(1.3835058055282E+19)
Output for 4.3.0 - 4.3.11, 5.0.0 - 5.0.4
9007199254740991 PHP_INT_MAX int(0)
preferences:
287.76 ms | 402 KiB | 460 Q