PHP: 调用未定义函数: simplexml_load_string()

我正在使用 cron 文件实现 facebook 计数功能。其中 cron 每10分钟运行一次，并计算一个页面的总喜欢数。

for($i=0;$i<3;$i++){
$source_url =$cars[$i];
$rest_url = "http://api.facebook.com/restserver.php?method=links.getStats&urls=".urlencode($source_url);
$curl = curl_init();
curl_setopt($curl, CURLOPT_URL,$rest_url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$content = curl_exec($curl);
curl_close($curl);
$message=stripslashes($content);
$xml_record = simplexml_load_string($message);
$fb_like_count = $xml_record->link_stat->like_count;
echo "".$fb_like_count;
mail("abc@gmail.com","hi".$fb_like_count,$message);
}

但是我得到未定义的调用函数错误。

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Make sure that you have php-xml module installed and enabled in php.ini.

You can also change response format to json which is easier to handle. In that case you have to only add &format=json to url query string.

$rest_url = "http://api.facebook.com/restserver.php?method=links.getStats&format=json&urls=".urlencode($source_url);

And then use json_decode() to retrieve data in your script:

$result = json_decode($content, true);
$fb_like_count = $result['like_count'];
小开

If the XML module is not installed, install it.

Current version 5.6 on ubuntu 14.04:

sudo apt-get install php5.6-xml

And don't forget to run sudo service apache2 restart command after it

Zulhilmi Zainudi

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For PHP 7 and Ubuntu 14.04 the procedure is follows. Since PHP 7 is not in the official Ubuntu PPAs you likely installed it through Ondřej Surý's PPA (sudo add-apt-repository ppa:ondrej/php). Go to /etc/php/7.0/fpm and edit php.ini, uncomment to following line:

extension=php_xmlrpc.dll

Then simply install php7.0-xml:

sudo apt-get install php7.0-xml

And restart PHP:

sudo service php7.0-fpm restart

And restart Apache:

sudo service apache2 restart

If you are on a later Ubuntu version where PHP 7 is included, the procedure is most likely the same as well (except adding any 3rd party repository).

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I think it can be something like in this Post: Class 'SimpleXMLElement' not found on puphpet PHP 5.6 So maybe you could install/activate

php-xml or php-simplexml

Do not forget to activate the libraries in the php.ini file. (like the top comment)

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To fix this error on Centos 7:

  1. Install PHP extension:

    sudo yum install php-xml

  2. Restart your web server. In my case it's php-fpm:

    services php-fpm restart

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I also faced this issue. My Operating system is Ubuntu 18.04 and my PHP version is PHP 7.2.

Here's how I solved it:

Install Simplexml on your Ubuntu Server:

sudo apt-get install php7.2-simplexml

Restart Apache Server

sudo systemctl restart apache2

That's all.

I hope this helps

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For Nginx (without apache) and PHP 7.2, installing php7.2-xml wasn't enough. Had to install php7.2-simplexml package to get it to work

So the commands for debian/ubuntu, update packages and install both packages

apt update
apt install php7.2-xml php7.2-simplexml

And restart both Nginx and php

systemctl restart nginx php7.2-fpm

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