3v4l.org

run code in 300+ PHP versions simultaneously
<?php function printer() { $line = 1; while (true) { $string = yield; echo ($line++).$string.PHP_EOL; } } $printer = printer(); $printer->send('Hello world!'); $printer->send('Bye world!');
Output for 5.5.31, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.13
1Hello world! 2Bye world!
preferences:
152.92 ms | 408 KiB | 5 Q