PHP uses regular expressions to extract links in content

This article mainly introduces the relevant information about PHP regular expressions to obtain all links of the content. Friends in need can refer to it.

Method one:

function get_all_url($code){ 
    preg_match_all(&#39;/<as+href=["|&#39;]?([^>"&#39; ]+)["|&#39;]?s*[^>]*>([^>]+)</a>/i&#39;,$code,$arr); 
    return array(&#39;name&#39;=>$arr[2],&#39;url&#39;=>$arr[1]); 
}

Method two:

/**
 * date 2015-07-24
 **/
 
$site=substr($url,0,strpos($url,"/",8));//站点 
$base=substr($url,0,strrpos($url,"/")+1);//文件所在目录 
$fp = fopen($url, "r" );//打开url 
while(!feof($fp))$contents.=fread($fp,1024);// 
$pattern="|href=['"]?([^ '"]+)['" ]|u"; 
preg_match_all($pattern,$contents, $regarr, preg_set_order);//匹配所有href= 
for($i=0;$i<count($regarr);$i++){//遍历所有匹配 
if(!eregi("://",$regarr[$i][1]))//是否是相对路径，即是否还有:// 
if(substr($regarr[$i][1],0,1)=="/")//是否是站点的根目录 
  echo "link".($i+1).":".$site.$regarr[$i][1]."<br/>";//根目录 
else
  echo "link".($i+1).":".$base.$regarr[$i][1]."<br/>";//当前目录 
else
echo "link".($i+1).":".$regarr[$i][1]."<br/>";//相对路径 
}
fclose($fp);

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