3v4l.org

run code in 300+ PHP versions simultaneously
<?php function display($a, $b) { echo $a; echo ' '; echo $b; } $i = 0; ${"sR{$i}S1"} = "hello"; ${"nR{$i}S1P"} = "world"; display(${"sR{$i}S1"}, ${"nR{$i}S1P"});
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
hello world

preferences:
213.5 ms | 406 KiB | 317 Q