PHP uses preg_match_all to match pictures in articles, _PHP tutorial

php uses preg_match_all to match the pictures in the article.

Sometimes we need to use php to get the pictures in the web page and save them. Here we can use preg_match_all to match the picture address. Coders who need it can refer to it

preg_match_all function:

int preg_match_all (string pattern, string subject, array matches [, int flags]) performs a global regular expression match
Search in subject for all regular expressions given by pattern What the expression matches and the results are placed in matches in the order specified by flags.
After the first match is found, subsequent searches start from the end of the previous match.
flags can be a combination of the following flags (note that it does not make sense to use PREG_PATTERN_ORDER and PREG_SET_ORDER together):
PREG_PATTERN_ORDER Sort the results so that $matches[0] is the array of all pattern matches, and $matches[1] is the array of all pattern matches. An array of strings matched by the subpattern in parentheses, and so on!

Example:

<?<span>php
</span><span>$con</span> = <span>file_get_contents</span>("http://www.xxx.com/news/jb-1.html"<span>);
</span><span>$pattern</span>="/<[img|IMG].*?src=[\'|\"](.*?(?:[\.gif|\.jpg|\.png]))[\'|\"].*?[\/]?>/"<span>;
</span><span>preg_match_all</span>(<span>$pattern</span>,<span>$con</span>,<span>$match</span><span>);
</span><span>print_r</span>(<span>$match</span><span>);
</span>?> 

Result:

<span>Array</span><span>
(
    [</span>0] => <span>Array</span><span>
        (
            [</span>0] => <img src="http://www.xxx.com/usr/themes/dddefault/images/logo.png" alt="码农教程" /><span>
            [</span>1] => <img>
            [</span>2] => <img>
        )
    [</span>1] => <span>Array</span><span>
        (
            [</span>0] => http:<span>//</span><span>www.xxx.com/usr/themes/dddefault/images/logo.png</span>
            [1] => http:<span>//</span><span>www.xxx.com/usr/uploads/2012/09/531656480.jpg</span>
            [2] => http:<span>//</span><span>www.xxx.com/usr/uploads/2012/09/2647136297.jpg</span>
<span>        )
)</span>

Original address: http://www.manongjc.com/article/708.html

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