How to use preg_replace function to match images and add links in PHP_PHP Tutorial

Introduction: preg_replace performs regular expression search and replacement. If you are simply matching strings, it is recommended to use str_replace(), because its execution efficiency is much higher.
mixed preg_replace (mixed pattern, mixed replacement, mixed subject [, int limit])

Search the subject for a match of the pattern pattern and replace it with replacement. If limit is specified, only limit matches are replaced; if limit is omitted or has a value of -1, all matches are replaced.

Referring to what I said before, PHP uses preg_match_all to match the pictures in the article. The code for matching pictures and adding links is given below:

Copy code The code is as follows:

$con = file_get_contents("http://www .jb51.net/");
$pattern="/<[img|IMG].*?src=['|"](.*?(?:[.gif|.jpg|.png] ))['|"].*?[/]?>/";
$new_con = preg_replace($pattern,"$0",$ con);
echo $new_con;
?>

Explanation: $0 represents the matching content, $1 represents the matching content of the first (), $2 represents the matching content of the second (), and so on!
This will add a link to the picture. Friends who are interested may wish to test it themselves.

http://www.bkjia.com/PHPjc/326644.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/326644.htmlTechArticleIntroduction: preg_replace performs regular expression search and replacement. If you are simply matching strings, it is recommended to use str_replace() , because its execution efficiency is much higher. mixed preg_replace...