PHP converts the url address into a complete a tag link code (php adds an a tag to the url address)_PHP tutorial

The content that needs to be extracted is as follows:

Copy code The code is as follows:

http: //baidu.comThis is the first A tag,
Growth footprints - focusing on Internet development This is the second A tag.
http://www.jb51.net This is the first URL address that needs to be extracted,
http://blog.baidu.com This is the second URL address that needs to be extracted'.
, this is an IMG tag

Similar to the automatic extraction of URLs as hyperlink addresses in Weibo. That is, the content is extracted, added with an A tag, and converted into a real hyperlink. I searched online for a long time and didn't find a practical solution. Most of them simply extract the URL (the addresses in the A tag and IMG tag are also extracted and replaced), which cannot meet the above needs. There is no method found in regular expressions that can filter out the A tag during extraction. So I changed my thinking and decided to "save the country through curves". That is, first replace all A tags and IMG tags with a unified tag, then extract the URL address and replace it with a hyperlink, and finally restore and replace the unified tag with the previous A tag and IMG tag.

Copy code The code is as follows:

function linkAdd($content){
//Extract and replace all A tags (Unified tag<{link}>)
preg_match_all('/.*?/i',$content ,$linkList);
$linkList=$linkList[0];
$str=preg_replace('/.*?< /a>/i','<{link}>',$content);

//Extract and replace all IMG tags (unified tag <{img}>)
preg_match_all('/]+>/im',$content,$imgList );
$imgList=$imgList[0];
$str=preg_replace('/]+>/im','<{img}>',$ str);

//Extract and replace the standard URL address
$str=preg_replace('(((f|ht){1}tp://)[-a-zA-Z0-9 @:%_/+.~#?&//=]+)','http://baidu.comThis is the first A tag,
< a href="http://blog.baidu.com">Growth Footprints - Focus on Internet DevelopmentThis is the second A tag.
http://www.jb51.net This is the first URL address that needs to be extracted.
http://blog.baidu.com This is the second URL address that needs to be extracted.
, this is an IMG tag';
echo linkAdd($content);


The content returned is:




Copy code

The code is as follows:


http: //baidu.comThis is the first A tag, Growth footprints - focusing on Internet developmentThis is the first Two A tags. http://www.jb51.netThis is the first URL address that needs to be extracted, < a href="http://blog.baidu.com" target="_blank">http://blog.baidu.comThis is the second URL address that needs to be extracted.
, this is an IMG tag

is what we want.
Example 2,

Copy code The code is as follows:

/**
* PHP version modified based on Silva code
* Convert URL address into complete A tag link code
*/

function replace_URLtolink($text) {
    // grab anything that looks like a URL...
    $urls = array();

    // build the patterns
    $scheme = '(https?://|ftps?://)?';
    $www = '([w]+.)';
    $ip = '(d{1,3}.d{1,3}.d{1,3}.d{1,3})';
    $name = '([w0-9]+)';
    $tld = '(w{2,4})';
    $port = '(:[0-9]+)?';
    $the_rest = '(/?([w#!:.?+=&%@!-/]+))?';
    $pattern = $scheme.'('.$ip.$port.'|'.$www.$name.$tld.$port.')'.$the_rest;
    $pattern = '/'.$pattern.'/is';

    // Get the URLs
    $c = preg_match_all($pattern, $text, $m);

    if ($c) {
        $urls = $m[0];
    }

    // Replace all the URLs
    if (! empty($urls)) {
        foreach ($urls as $url) {
            $pos = strpos('http://', $url);

            if (($pos && $pos != 0) || !$pos) {
                $fullurl = 'http://'.$url;
            } else {
                $fullurl = $url;
            }

            $link = ''.$url.'';

            $text = str_replace($url, $link, $text);
        }
    }

    return $text;
}

http://www.bkjia.com/PHPjc/710607.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/710607.htmlTechArticle需要提取的内容如下： 复制代码 代码如下: a href="http://baidu.com"http://baidu.com/a这是第一个A标签， a href="http://blog.baidu.com"成长脚印-专注于互...