Online PHP editor | refs for aJ3HO

<?php define('PINGTAGS', [ '#' => 'hashtag.php?hashtag', '@' => 'user.php?user' ]); function convert_text($str) { return preg_replace_callback( "~(?i)\bhttps?[-\w.\~:/?#[\]@!$&'()*+,;=]+|[@#](\w+)|U\+([A-F\d]{5})~", function($m) { // var_export($m); // see for yourself if (!isset($m[1])) { return sprintf('<a href="%s">%s</a>', $m[0], $m[0]); } if (!isset($m[2])) { return sprintf('<a href="%s=%s">%s</a>', PINGTAGS[$m[0][0]], $m[1], $m[0]); } return "<span class=\"emoji\">&#x{$m[2]};</span>"; }, $str); } echo convert_text( <<<STRING This is a @ping and a #hash. This is a www.example.com, this is http://example.com?asdf=1234#anchor https://www.example.net/a/b/c/?g=5&awesome=foobar# U+23232 http://www5.example.com https://sub.sub.www.example.org/ @pong@pug#tagged http://example.com/@dave more http://example.com/more_(than)_one_(parens) andU+98765more http://example.com/blah_(wikipedia)#cite-1 and more http://example.com/blah_(wikipedia)_blah#cite-1 and more http://example.com/(something)?after=parens STRING );