3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = str_repeat('foo', 500000000); $y = 'bar'; $before = microtime(1); $x = $x . $y; var_dump(microtime(1) - $before);
Output for 7.0.0 - 7.1.0
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 1500000032 bytes) in /in/Heo17 on line 3
Process exited with code 255.
Output for 4.3.0 - 5.1.6, hhvm-3.10.0 - 3.12.0

Process exited with code 137.
Output for 5.2.1 - 5.6.28
Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 1500000001 bytes) in /in/Heo17 on line 3
Process exited with code 255.
Output for 5.2.0
Fatal error: Out of memory (allocated 262144) (tried to allocate 1500000001 bytes) in /in/Heo17 on line 3
Process exited with code 255.