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run code in 300+ PHP versions simultaneously
<?php (number_format(1e80, 0, '', ' ')); (number_format(1e300, 0, '', ' ')); (number_format(1e320, 0, '', ' ')); echo strlen($a) . "\n"; echo 4; number_format(1e1000, 0, '', ' '); echo "Done\n"; ?>
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Warning: Undefined variable $a in /in/7Z5F8 on line 5 Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /in/7Z5F8 on line 5 0 4Done
Output for 8.0.0 - 8.0.30
Warning: Undefined variable $a in /in/7Z5F8 on line 5 0 4Done
Output for 5.1.2 - 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 - 5.6.38, 7.0.0 - 7.0.32, 7.1.0 - 7.1.24, 7.2.0 - 7.2.33, 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: a in /in/7Z5F8 on line 5 0 4Done
Output for 7.3.32 - 7.3.33
0 4Done
Output for 4.3.3 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5, 5.1.0 - 5.1.1

Process exited with code 139.
Output for 4.3.0 - 4.3.2, 4.4.2 - 4.4.9
Notice: Undefined variable: a in /in/7Z5F8 on line 5 0 4Done
preferences:
241.64 ms | 402 KiB | 421 Q