php使用preg_match_all匹配文章中的图片,
php使用preg_match_all匹配文章中的图片,
有时候我们需要使用php获取网页中的图片并保存下来,这里我们可以使用preg_match_all用来匹配图片地址,需要的码农可以参考下
preg_match_all 函数:
int preg_match_all ( string pattern, string subject, array matches [, int flags] )执行一个全局正则表达式匹配
在 subject 中搜索所有与 pattern 给出的正则表达式匹配的内容并将结果以 flags 指定的顺序放到 matches 中。
搜索到第一个匹配项之后,接下来的搜索从上一个匹配项末尾开始。
flags 可以是下列标记的组合(注意把 PREG_PATTERN_ORDER 和 PREG_SET_ORDER 合起来用没有意义):
PREG_PATTERN_ORDER 对结果排序使 $matches[0] 为全部模式匹配的数组,$matches[1] 为第一个括号中的子模式所匹配的字符串组成的数组,以此类推!
例子:
<?<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>?>
结果:
<span>Array</span><span> ( [</span>0] => <span>Array</span><span> ( [</span>0] => <img src="/static/imghw/default1.png" data-src="http://www.xxx.com/usr/themes/dddefault/images/logo.png" class="lazy" alt="码农教程" /><span> [</span>1] => <img alt="php使用preg_match_all匹配文章中的图片," > [</span>2] => <img alt="php使用preg_match_all匹配文章中的图片," > ) [</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>
原文地址:http://www.manongjc.com/article/708.html
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