3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(-1); $x = array(1,2,3,4); $x[] =& $x; echo count($x);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 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 - 5.5.17, 5.5.19 - 5.5.21, 5.5.23 - 5.5.24, 5.5.26 - 5.5.28, 5.5.32 - 5.5.38, 5.6.0, 5.6.2 - 5.6.7, 5.6.9 - 5.6.11, 5.6.13 - 5.6.14, 5.6.16 - 5.6.18, 5.6.21 - 5.6.26, 5.6.28 - 5.6.30, 5.6.35 - 5.6.40, 7.0.1, 7.0.4 - 7.0.8, 7.0.11, 7.0.13, 7.0.16, 7.0.18 - 7.0.20, 7.0.25 - 7.0.33, 7.1.3, 7.1.7 - 7.1.10, 7.1.12, 7.1.14 - 7.1.16, 7.1.21 - 7.1.33, 7.2.0 - 7.2.2, 7.2.8, 7.2.10 - 7.2.18, 7.2.20 - 7.2.26, 7.3.0 - 7.3.4, 7.3.6, 7.3.8 - 7.3.13, 7.4.0 - 7.4.1, 8.1.28, 8.2.15 - 8.2.18, 8.3.2 - 8.3.6
5
Output for 7.3.7
5
Process exited with code 137.
Output for 5.5.18, 5.5.22, 5.5.25, 5.5.29 - 5.5.31, 5.6.1, 5.6.8, 5.6.12, 5.6.15, 5.6.19 - 5.6.20, 5.6.27, 5.6.31 - 5.6.34, 7.0.0, 7.0.2 - 7.0.3, 7.0.9 - 7.0.10, 7.0.12, 7.0.14 - 7.0.15, 7.0.17, 7.0.21 - 7.0.24, 7.1.0 - 7.1.2, 7.1.4 - 7.1.6, 7.1.11, 7.1.13, 7.1.17 - 7.1.20, 7.2.3 - 7.2.7, 7.2.9, 7.2.19, 7.3.5

Process exited with code 137.

preferences:
213.08 ms | 406 KiB | 335 Q