提取数据失败错误“调用非对象上的成员函数find（）”

<?php
header('Content-type: text/plain; charset=utf-8');

include('simple_html_dom.php');
$html = file_get_html('http://www.test.com/');

// Find all links 
foreach($html->find('a') as $element) {
  echo $element->href . '<br>';
}

?>

Why does this code not work? I still receive this error:

Call to a member function find() on a non-object in …

Try using var_dump to see the result of your function call.

Most likely the php.ini configuration forbids you to get external data. Check your phpinfo() for more details on this. The property to look at is 'allow_url_fopen'