PHP解析urlmailto和twitter™s用户名和参数

Posted 2021-02-26

This small function receive a text as input and returns an html text with links if the source text contains urls (http://www… but also ftp://… and every other protocol), emails, twitter’s usernames (with @ at the beginning) and also twitter tags (with # at the beginning).

function parse_twitter($t) {
	// link URLs
	$t = " ".preg_replace( "/(([[:alnum:]]+://)|www.)([^[:space:]]*)".
		"([[:alnum:]#?/&=])/i", "<a href="\1\3\4" target="_blank">".
		"\1\3\4</a>", $t);
 
	// link mailtos
	$t = preg_replace( "/(([a-z0-9_]|\-|\.)[email protected]([^[:space:]]*)".
		"([[:alnum:]-]))/i", "<a href="mailto:\1">\1</a>", $t);
 
	//link twitter users
	$t = preg_replace( "/ [email protected]([a-z0-9_]*) ?/i", " <a href="http://twitter.com/\1" target="_blank">@\1</a> ", $t);
 
	//link twitter arguments
	$t = preg_replace( "/ +#([a-z0-9_]*) ?/i", " <a href="http://twitter.com/search?q=%23\1" target="_blank">#\1</a> ", $t);
 
	// truncates long urls that can cause display problems (optional)
	$t = preg_replace("/>(([[:alnum:]]+://)|www.)([^[:space:]]".
		"{30,40})([^[:space:]]*)([^[:space:]]{10,20})([[:alnum:]#?/&=])".
		"</", ">\3...\5\6<", $t);
	return trim($t);
}