Php regular expression method for retrieving all links to content, php Regular Expression

Php regular expression method for retrieving all links to content, php Regular Expression

This example describes how to obtain all links of the content using a php regular expression. Share it with you for your reference. The details are as follows:

Here we provide two methods for php regular links. They can get all links to the content and save them to an array. Of course, they can also replace all links.

Method 1: the code is as follows:
Copy codeThe code is as follows: function get_all_url ($ code ){
Preg_match_all ('/<as + href = ["|']? ([^> "'] +) [" |']? S * [^>] *> ([^>] +) </a>/I ', $ code, $ arr );
Return array ('name' => $ arr [2], 'url' => $ arr [1]);
}
Method 2: the code is as follows:
Copy codeCode: $ site = substr ($ url, 0, strpos ($ url, "/", 8); // site
$ Base = substr ($ url, 0, strrpos ($ url, "/") + 1); // directory of the file
$ Fp = fopen ($ url, "r"); // open the url
 
While (! Feof ($ fp) $ contents. = fread ($ fp, 1024 );//
$ Pattern = "| href = ['"]? ([^ '"] +) ['"] | U ";
 
Preg_match_all ($ pattern, $ contents, $ regarr, preg_set_order); // match all href =
For ($ I = 0; $ I <count ($ regarr); $ I ++) {// traverse all matches
If (! Eregi (": //", $ regarr [$ I] [1]) // whether it is a relative path, that is, whether there are ://
If (substr ($ regarr [$ I] [1],) = "/") // whether it is the root directory of the site
Echo "link". ($ I + 1). ":". $ site. $ regarr [$ I] [1]. "<br/>"; // root directory
Else
Echo "link". ($ I + 1). ":". $ base. $ regarr [$ I] [1]. "<br/>"; // Current Directory
Else
Echo "link". ($ I + 1). ":". $ regarr [$ I] [1]. "<br/>"; // relative path
}
Fclose ($ fp );

I hope this article will help you learn regular expressions.