Grab and download the php code of all image files in CSS_PHP Tutorial

The highlight of this article is that the regular expression is more complicated, ╮(-_-)╭, and it is a very powerful use of the Copy function.
> By the way, I just heard NsYta say that Xiao Xie’s theme is too white, which is ridiculous. I'm too busy recently and don't have time, otherwise I would create a new theme myself.

1. Grab images in CSS:
> 1. First make preparations:
> The first step is to save the original path of CSS into the $url variable. Then save the CSS content in abc.css.
> Considering that multiple CSS files are often encountered, Xiaoxie did not directly fill in a CSS path.
> Instead, merge the contents of several CSS files together and stuff them all into the abc.css file. Quack.

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

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

> The first file is at /upload/201109/20110926143903807.gif, because its path uses a relative root path.
> And the second one is at /upload/201109/20110926143903169.gif, and its path is just an ordinary relative path.

Copy code The code is as follows:

$url = 'http://www.jb51.net/css/'; preg_match('/(.*//.*?)//',$url,$host);
//Here, use regular expressions to take out http://www.jb51.net/, backend Don't forget to add the slash.
//.*? is lazy matching, that is, the less content it can match, the less content it can match, so that it will not be overdone.
$host = $host[1];

2. Create the image storage folder:
> Xiaoxie used is_dir here to determine whether the folder exists. If it exists, there is no need to create it a second time.
> Haha, by the way, the is_file function can determine whether this file is a normal file and whether it exists.
> But file_exists() is superior, because I saw someone discussing it on Webmasterworld.com once.

if (!is_dir('img')) { mkdir('img'); }

> 3. Use regular expressions to get the relative address of the image:

$regex = '/url('{0,1}"{0,1}(.*?)'{0,1}"{0,1})/';
//Use regular expressions here To match the image address, three situations must be considered, namely url(1.gif) url('1.gif') url("1.gif").
//These three writing methods can be used, so we will use the above regular rules to take out the 1.gif inside.
//'{0,1} means that single quotes may appear 1 or 0 times, " means that double quotes may appear 1 or 0 times.
//Lazy matching must be used in the middle, otherwise it will be taken out It's 1.gif" instead of 1.gif bird, O(∩_∩)P.
preg_match_all($regex,$data,$result);

> 4. Process these images:

> First use a loop to extract the above using regular expressions Let’s deal with the content array of the first branch.
> Well, the first branch here represents the first bracket in the regular expression, haha, and so on.

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

> Then use regular expressions to determine, because you also need to consider this /upload/201109/20110926143903807.gif.
> This uses the complete path instead of /img/1.gif or img/1.gif like others.
> So judge it separately, and then judge these two to see if it is /img/1.gif or img/1.gif.

Copy code The 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."
rn";

> Finally, take out the file name, which is 1.gif in /img/1.gif , used to save files.

Copy code The code is as follows:

preg_match('/.*/(.*.D+)$/',$ val,$name);

> Then we can start downloading. Here we will introduce the usage of a powerful Copy function.

Copy code The 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 method is our old method, quack, it’s very troublesome. One time, Xiao Xie suddenly discovered the power of Copy.
> Copy can actually be downloaded, so you can easily use the following code to process it, and the above one can be retired.

Copy code The code is as follows:

if (!is_file('./img/'.$name[1]) ) {
copy($target,'./img/'.$name[1]);
}

> 5. Complete source code:

> When using, just fill in $url, and then save all CSS content to abc.css.

Copy code The code is as follows:

$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 $target."
rn";
preg_match('/.*/(.*.D+)$/',$val,$name);
if (!is_file('./img/'.$name[1])) {
copy($target,'./img/'.$name[1]);
}
}?>

http://www.bkjia.com/PHPjc/324413.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/324413.htmlTechArticleThe highlight of this article is that the regular expression is more complicated, ╮(-_-)╭, and then Copy A very powerful use of functions. By the way, I just heard NsYta say that Xiao Xie’s theme is too white, and it’s a waste. ...