解析頁面內容時刪除DocDocument警告

Question

我想解析任何url的內容。哪個不應該包含任何html代碼。 這工作正常，但在閱讀給定的網址上的內容時出現一堆錯誤。如何刪除此警告？

<?php 
$url= 'http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page'; 
$doc = new DOMDocument(); 
$doc->loadHTMLFile($url); 
$xpath = new DOMXPath($doc); 
foreach($xpath->query("//script") as $script) { 
    $script->parentNode->removeChild($script); 
} 
$textContent = $doc->textContent; //inherited from DOMNode 
echo $textContent; 
?> 

警告：

content-from-a-web-page, line: 255 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 255 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 273 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 273 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 412 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 412 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 551 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Warning: DOMDocument::loadHTMLFile(): htmlParseEntityRef: expecting ';' in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 551 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Warning: DOMDocument::loadHTMLFile(): ID display-name already defined in http://stackoverflow.com/questions/12097352/how-can-i-parse-dynamic-content-from-a-web-page, line: 731 in /opt/lampp/htdocs/FB/ec2/test.php on line 13 

Answer 1

您可以使用libxml_use_internal_errors()並執行以下操作：

libxml_use_internal_errors(true); 
$doc->loadHTMLFile($url); 
libxml_clear_errors(); 

正如Peehaa在下面的評論指出，這是重置錯誤的狀態是個好主意。你可以如下做到這一點：

$errors = libxml_use_internal_errors(true); //store 
$doc->loadHTMLFile($url); 
libxml_clear_errors(); 
libxml_use_internal_errors($errors); //reset back to previous state 

下面是它如何工作的：

• libxml_use_internal_errors()告訴的libxml來處理內部的錯誤和警告，而且它不應該被輸出到瀏覽器。也存儲在一個變量
• 當前的錯誤狀態，那麼您加載HTML文件loadHTML()方法
• 明確與libxml_clear_errors
• 錯誤緩衝區恢復錯誤的老態值

Demo!