php实现使用正则将文本中的网址转换成链接标签
本文给大家分享一段php中使用正则表达式将网址转换成A链接的函数代码，十分简洁实用，这里推荐给大家，代码如下:
- function text2links($str='') {
- if($str=='' or !preg_match('/(http|www\.|@)/i', $str)) { return $str; }
- $lines = explode("\n", $str); $new_text = '';
- while (list($k,$l) = each($lines)) {
- // replace links:
- $l = preg_replace("/([ \t]|^)www\./i", "\\1http://www.", $l);
- $l = preg_replace("/([ \t]|^)ftp\./i", "\\1ftp://ftp.", $l);
- $l = preg_replace("/(http:\/\/[^ )\r\n!]+)/i",
- "<a href=\"\\1\">\\1</a>", $l);
- $l = preg_replace("/(https:\/\/[^ )\r\n!]+)/i",
- "<a href=\"\\1\">\\1</a>", $l);
- $l = preg_replace("/(ftp:\/\/[^ )\r\n!]+)/i",
- "<a href=\"\\1\">\\1</a>", $l);
- $l = preg_replace(
- "/([-a-z0-9_]+(\.[_a-z0-9-]+)*@([a-z0-9-]+(\.[a-z0-9-]+)+))/i",
- "<a href=\"mailto:\\1\">\\1</a>", $l);
- $new_text .= $l."\n";
- }
- return $new_text;
- }