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HomeBackend DevelopmentPHP Tutorial如何正则出HTTP开头的JPG图片?

我使用 simple_html_dom.php, 只会找出HTTP开头的图片,如何再加一个JPG结尾的判断?

foreach ($html->find('img[src^="http"]') as $element) 
 

或者
哪位给写个 preg_match_all 所有 HTTP开头的JPG图片?谢谢。


回复讨论(解决方案)

不是太明白你想表达的意思,这是我学正则的时候写的,获取一个网页图片的,

<?php/* * @param string $url 采集url * @param int $isinsite 是否为站内的 默认1为站内0为站外站内 * @return string  */function getallimg($url,$isinsite=1){    $urlstr=parse_url($url);    $url=$urlstr[scheme]?$url:"http://".$urlstr[path];//判断用户输入的网址有没有包含http://再进行补全    $urlstr=parse_url($url);    $site="http://".$urlstr[host];//取本站地址    $subject =file_get_contents($url);    $pattern = '/.*<img  src="/static/imghwm/default1.png"  data-src=".$url."  class="lazy"  .*src=[\'|\"](.*[.jpg|.gif|.png])[\'|\"].*\/?? alt="如何正则出HTTP开头的JPG图片?" >.*/U';//其中的//为分隔符    preg_match_all($pattern,$subject,$result);//查找所有的匹配项    if($isinsite==0)    {       foreach ($result as $key => $value) //二维数组$result[n][m];               {	             if($key==1)	               {   		            foreach ( $value as $key => $value )//取$result[m]		                    {			                   $isownsite=parse_url($value);			                   $url=$isownsite[host]?$value:$site.$isownsite[path];//获取该网页的所有图片还其他网址的			                   $imgcontent.="<img  src="/static/imghwm/default1.png"  data-src=".$url."  class="lazy"    alt="如何正则出HTTP开头的JPG图片?" >|";		                    }		           }               }    }    if($isinsite==1)    {       foreach ($result as $key => $value) //二维数组$result[n][m];               {	             if($key==1)	               {   		            foreach ( $value as $key => $value )//取$result[m]		                    {			                   $isownsite=parse_url($value);			                   $url=$isownsite[host]?NULL:$site.$isownsite[path];//只获取该site的不含外部网址			                   if($url!=NULL)			                   $imgcontent.="<img  src="/static/imghwm/default1.png"  data-src=".$url."  class="lazy"    alt="如何正则出HTTP开头的JPG图片?" >|";		                    }		           }               }    }    return $imgcontent;}?><form action="getimg.php" method="post"><input type="radio" name="onlysite" value="1" />找全站内图片<br/><input type="radio" name="onlysite" value="0" />找全站内站外图片<br/><input type="text"name="site" size="70"/>多个网址请用&#64;隔开如:www.baidu.com@www.h2ero.cn<br/><input type="submit"  name="name" value="找图" /></form><?php$url=$_POST[site];$url=explode("@",$url);$isinsite=$_POST[onlysite];for ( $i = 0;$i <2; $i++ ) {	    if($url[$i]!=NULL)	echo getallimg($url[$i],$isinsite);}?>

.*如何正则出HTTP开头的JPG图片?.*/U'
这样的话,连"../images/1.jpg"也抓出来了。
而我需要的是 http:// 开头的所有图片 "http://domain.com/images/1.jpg"

你就正则匹配http开头就好了

你就正则匹配http开头就好了
现在过渡依赖于simple_html_dom,怎么修改正则呢?

再加一句正则就可以了

foreach ($html->find('img[src^="http"]') as $element) {
  if(preg_match('/\.jpg/i',$element->src)){
    echo $element->src . "
\n";
  }
}

感谢 ,life169 

你就正则匹配http开头就好了











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