3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo() { $GLOBALS['stack'] = debug_backtrace(); } ob_start('foo'); ob_get_flush(); print_r($stack);
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 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 ( [0] => Array ( [function] => foo [args] => Array ( [0] => [1] => 9 ) ) [1] => Array ( [file] => /in/P521O [line] => 10 [function] => ob_get_flush [args] => Array ( ) ) )
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29
Array ( [0] => Array ( [function] => foo [args] => Array ( [0] => [1] => 5 ) ) [1] => Array ( [file] => /in/P521O [line] => 10 [function] => ob_get_flush [args] => Array ( ) ) )
Output for 5.0.0 - 5.0.4
Array ( [0] => Array ( [file] => /in/P521O [line] => 10 [function] => foo [args] => Array ( [0] => [1] => 5 ) ) [1] => Array ( [file] => /in/P521O [line] => 10 [function] => ob_get_flush [args] => Array ( ) ) )
preferences:
253 ms | 402 KiB | 423 Q