3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace f; function test() { test2(); } function test2() { print_r(current(array_slice((debug_backtrace(0)), 1, 1, true))); } function next($a) { return next($a); } test();
Output for 5.3.1 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Array ( [file] => /in/qb4DE [line] => 17 [function] => f\test [args] => Array ( ) )
Output for 5.3.0
Strict Standards: Only variables should be passed by reference in /in/qb4DE on line 10 Array ( [file] => /in/qb4DE [line] => 17 [function] => f\test [args] => Array ( ) )
Output for 5.2.3 - 5.2.17
Parse error: syntax error, unexpected T_STRING in /in/qb4DE on line 3
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2
<br /> <b>Parse error</b>: syntax error, unexpected T_STRING in <b>/in/qb4DE</b> on line <b>3</b><br />
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
<br /> <b>Parse error</b>: parse error, unexpected T_STRING in <b>/in/qb4DE</b> on line <b>3</b><br />
Process exited with code 255.
Output for 4.3.2 - 4.3.4
<br /> <b>Parse error</b>: parse error in <b>/in/qb4DE</b> on line <b>3</b><br />
Process exited with code 255.

preferences:
263.71 ms | 401 KiB | 460 Q