3v4l.org

run code in 300+ PHP versions simultaneously
<?php $v = '<html'; echo "XXX v is"; echo "len ".strlen($v)."\n"; echo substr($v,1)."\n "; echo ord($v[0])."\n "; echo $v."\n "; flush(); echo "echoing done\n"; echo "vd1\n"; echo "vd2\n"; var_dump($v); echo "AFTER\n";
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, 5.5.0 - 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
XXX v islen 5 html 60 <html echoing done vd1 vd2 string(5) "<html" AFTER
preferences:
290.86 ms | 406 KiB | 460 Q