3v4l.org

run code in 300+ PHP versions simultaneously
<?php ob_start(function($buffer) { $backtrace = debug_backtrace(); return vsprintf('%d:%s => "%s"' . PHP_EOL, [ @$backtrace[0]['line'] ? : '-', @$backtrace[0]['file'] ? : '-', $buffer, ]); }, 1); ob_implicit_flush(true); echo 'foo'; echo 'bar';

preferences:
40.13 ms | 402 KiB | 5 Q