3v4l.org

run code in 300+ PHP versions simultaneously
<?php function filter(){ return 1;} $ololo = 'wat?'; $filter = 'ololo'; $k = "filter()"; echo $$k; echo "\n"; echo $$$k;
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
Warning: Undefined variable $filter() in /in/OUsrc on line 8 Warning: Undefined variable $filter() in /in/OUsrc on line 10 Warning: Undefined variable $ in /in/OUsrc on line 10
Output for 5.0.4 - 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 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: filter() in /in/OUsrc on line 8 Notice: Undefined variable: filter() in /in/OUsrc on line 10 Notice: Undefined variable: in /in/OUsrc on line 10
Output for 7.3.32 - 7.3.33
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.3
Notice: Undefined variable: filter() in /in/OUsrc on line 8 Notice: Undefined variable: filter() in /in/OUsrc on line 10 Notice: Undefined variable: in /in/OUsrc on line 10
preferences:
249.48 ms | 402 KiB | 370 Q