Capture and download php code for all image files in CSS

The highlight of this article is that the regular expression is more complex, namely, embedding (-_-) embedding, which is a very powerful usage of the Copy function.
> I heard from NsYta that the subject of Xiao Xie is too white. I am too busy recently. I am not empty. Otherwise, I will create a new topic myself.

1. capture images in CSS:
> 1. First, make preparations:
> Step 1: first save the original path of CSS to the $ url variable, and then save the CSS content in abc.css.
> Because multiple CSS files are frequently encountered, Xiao Xie does not directly fill in a CSS path.
> Instead, you can merge the contents of several CSS files into the abc.css file.

$ Data = file_get_contents('abc.css ');

> Read the content of the CSS file to the $ data variable, and then use the regular expression to retrieve the domain name.
> Because many image files use relative root paths, such as/img/1.gif and img/1.gif.
> Then the original CSS address is in the http://www.jb51.net/css/, so the two files above are different locations.

> The first file is in/upload/201109/20110926143903807 .gif, because its path uses the relative root path.
> The second one is in/upload/201109/20110926143903169 .gif, and its path is just a normal relative path.
Copy codeThe Code is as follows:
$ Url = 'HTTP: // www.jb51.net/css/'; preg_match ('/(.*\/\/.*?) \ // ', $ Url, $ host );
// Here with the regular expression of the http://www.jb51.net/to take out, the backend do not forget to add a slash Oh.
//.*? It is a lazy match, that is, the less content that can be matched, the less content that will be matched.
$ Host = $ host [1];

2. Create the image storage Folder:
> Here, Xiao Xie uses is_dir to determine whether a folder exists. If a folder exists, you do not need to create it again.
> By the way, the is_file function can determine whether the file is a normal file or whether the file exists.
> But file_exists () is better, because someone has discussed it on Webmasterworld.com.

If (! Is_dir ('img ') {mkdir ('img ');}

> 3. Obtain the relative address of the image using the regular expression:

$ Regex = '/url \ (\' {0, 1} \ "{0, 1 }(.*?) \ '{0, 1} \ "{0, 1 }\)/';
// Here, we use the regular expression to match the image address. There are three situations to consider: url(1.gif) url('1.gif ') url ("1.gif ").
// These three methods can be used, so we can use the above regular expression to extract 1.gif from it.
// \ '{0, 1} indicates that the single quotation mark may appear once or 0, and \ "indicates that the double quotation mark may appear once or 0.
// You must use a lazy match in the middle. Otherwise, the obtained result is 1.gif instead of 1.gif bird, O (prop _ prop) P.
Preg_match_all ($ regex, $ data, $ result );

> 4. process these images:

> First, use a loop to process the first branch content array extracted from the regular expression.
> Well, the first branch here represents the first parenthesis in the regular expression, and so on.

Foreach ($ result [1] as $ val ){}

> Then use the regular expression to determine, because/upload/201109/20110926143903807 .gifshould also be considered.
> The complete path is used, instead of/img/1.gif or img/1.gif.
> Let's take a separate look and then judge the two to see if they are/img/1.gif or img/1.gif.
Copy codeThe Code is as follows:
If (preg_match ('/^ http. */', $ val) {$ target = $ val ;}
Else if (preg_match ('/^ \/. */', $ val) {$ target = $ host. $ val ;}
Else {$ target = $ url. $ val ;}
Echo $ target. "<br/> \ r \ n ";

> Finally, extract the file name, that is, 1.gif in/img/1.gif, to save the file.
Copy codeThe Code is as follows:
Preg_match ('/. * \/(. * \. \ D +) $/', $ val, $ name );

> Then we can start the download. Here we will introduce a powerful Copy function usage.
Copy codeThe Code is as follows:
If (! Is_file ('./img/'. $ name [1]) {
$ Imgc = file_get_contents ($ target );
$ Handle = fopen ('./img/'. $ name [1], 'W + ');
Fwrite ($ handle, $ imgc );
Fclose ($ handle );
}

> The above is our old method. It's very troublesome. Once, Xiao Xie suddenly discovered the power of Copy.
> Copy can also be downloaded, so you can easily use the following code to process it. The above code can be used as a retired bird.
Copy codeThe Code is as follows:
If (! Is_file ('./img/'. $ name [1]) {
Copy ($ target, './img/'. $ name [1]);
}

> 5. complete source code:

> Fill in $ url and save all CSS content to abc.css.
Copy codeThe Code is as follows:
<? Php
$ Url = 'HTTP: // www.jb51.net/css /';
$ Data = file_get_contents('abc.css ');
Preg_match ('/(.*\/\/.*?) \ // ', $ Url, $ host );
$ Host = $ host [1];
If (! Is_dir ('img ') {mkdir ('img ');}
$ Regex = '/url \ (\' {0, 1} \ "{0, 1 }(.*?) \ '{0, 1} \ "{0, 1 }\)/';
Preg_match_all ($ regex, $ data, $ result );
Foreach ($ result [1] as $ val ){
If (preg_match ('/^ http. */', $ val) {$ target = $ val ;}
Else if (preg_match ('/^ \/. */', $ val) {$ target = $ host. $ val ;}
Else {$ target = $ url. $ val ;}
Echo $ target. "<br/> \ r \ n ";
Preg_match ('/. * \/(. * \. \ D +) $/', $ val, $ name );
If (! Is_file ('./img/'. $ name [1]) {
Copy ($ target, './img/'. $ name [1]);
}
}?>