3v4l.org

run code in 300+ PHP versions simultaneously
<?php function isUrl($value) { $alpha = "a-z\x80-\xFF"; $domain = "[0-9$alpha](?:[-0-9$alpha]{0,61}[0-9$alpha])?"; $topDomain = "[$alpha](?:[-0-9$alpha]{0,17}[$alpha])?"; return (bool) preg_match("(^https?://(?:(?:$domain\\.)*$topDomain|\\d{1,3}\.\\d{1,3}\.\\d{1,3}\.\\d{1,3}|\[[0-9a-f:]{3,39}\])(:\\d{1,5})?(/\\S*)?\\z)i", $value); } var_dump(isUrl("https://test.cz")); var_dump(isUrl("http://test.cz")); var_dump(isUrl("https://www.test.cz")); var_dump(isUrl("http://www.test.cz"));
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, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.5 - 7.2.33, 7.3.12 - 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
bool(true) bool(true) bool(true) bool(true)
preferences:
211.26 ms | 406 KiB | 313 Q