为什么我不能从这个网站上删除标题？

I'm using simple-html-dom to scrape the title off of a specified site.

<?php

include('simple_html_dom.php');

$html = file_get_html('http://www.pottermore.com/');

foreach($html->find('title') as $element) 
       echo $element->innertext . '<br>';

?>

Any other site I've tried works, apple.com for example.

But if I input pottermore.com, it doesn't output anything. Pottermore has flash elements on it, but the home screen I'm trying to scrape the title off of has no flash, just html.

This works for me :)

$url = 'http://www.pottermore.com/';
$html = get_html($url);
file_put_contents('page.htm',$html);//just to test what you have downloaded
echo 'The title from: '.$url.' is: '.get_snip($html, '<title>','</title>');

function get_html($url)
{
    $ch = curl_init();
    $header[0] = "Accept: text/xml,application/xml,application/xhtml+xml,";
    $header[0] .= "text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5";
    $header[] = "Cache-Control: max-age=0";
    $header[] = "Connection: keep-alive";
    $header[] = "Keep-Alive: 300";
    $header[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
    $header[] = "Accept-Language: en-us,en;q=0.5";
    $header[] = "Pragma: "; //browsers keep this blank.  
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows;U;Windows NT 5.0;en-US;rv:1.4) Gecko/20030624 Netscape/7.1 (ax)');
    curl_setopt($ch, CURLOPT_ENCODING, 'gzip,deflate');
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
    curl_setopt($ch, CURLOPT_AUTOREFERER, true);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_COOKIEFILE, COOKIE);
    curl_setopt($ch, CURLOPT_COOKIEJAR, COOKIE); 
    $result = curl_exec ($ch);
    curl_close ($ch);
    return($result);
}

function get_snip($string,$start,$end,$trim_start='1',$trim_end='1')
{
    $startpos = strpos($string,$start);
    $endpos = strpos($string,$end,$startpos);

    if($trim_start!='')
    {
        $startpos += strlen($start);
    }
    if($trim_end=='')
    {
        $endpos += strlen($end);
    }
    return(substr($string,$startpos,($endpos-$startpos)));
}

The function file_get_html uses file_get_contents under the covers. This function can pull data from a URL, but to do so, it sends a User Agent string.

By default, this string is empty. Some webservers use this fact to detect that a non-browser is accessing its data and opt to forbid this.

You can set user_agent in php.ini to control the User Agent string that gets sent. Or, you could try:

ini_set('user_agent','UA-String');

with 'UA-String' set to whatever you like.

Just to confirm what others are saying, if you don't send a user agent string this site sends 403 Forbidden.

Adding this worked for me:

User-Agent: Mozilla/5.0 (Windows;U;Windows NT 5.0;en-US;rv:1.4) Gecko/20030624 Netscape/7.1 (ax)