PHP抓取網頁內容，擷取連結絕對路徑和圖片絕對路徑

抓取網頁內容方法：

$ch = @curl_init($url);@curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);$text = @curl_exec($ch);@curl_close($ch);$text=relative_to_absolute($text,$url);

相對路徑轉絕對路徑方法：

function relative_to_absolute($content, $feed_url) {    preg_match('/(http|https|ftp):\/\//', $feed_url, $protocol);    $server_url = preg_replace("/(http|https|ftp|news):\/\//", "", $feed_url);    $server_url = preg_replace("/\/.*/", "", $server_url);    if ($server_url == '') {        return $content;    }    if (isset($protocol[0])) {        $new_content = preg_replace('/href="\//', 'href="'.$protocol[0].$server_url.'/', $content);        $new_content = preg_replace('/src="\//', 'src="'.$protocol[0].$server_url.'/', $new_content);    } else {        $new_content = $content;    }    return $new_content;}

擷取所有超連結方法：

function get_links($content) {    $pattern = '/<a(.*?)href="(.*?)"(.*?)>(.*?)<\/a>/i';    preg_match_all($pattern, $content, $m);    $re=array_unique($m[2]);    $i=0;    foreach ($re as $key => $value)    {        $regex = "(http|https|ftp|telnet|news)";        if((!empty($value)||strlen($value)>0)&&preg_match($regex,$value))            $output[$i++]=$value;    }    return  $output;}

擷取所有圖片連結方法：

function get_pic($str){    $imgs=array();    preg_match_all("/((http|https|ftp|telnet|news):\/\/[a-z0-9\/\-_+=.~!%@?#%&;:$\\()|]+\.(jpg|gif|png|bmp|swf|rar|zip))/isU",$str,$imgs);    return array_unique($imgs[0]);;}