php 致命错误：调用未定义的函数 mb_strlen()
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Fatal error: Call to undefined function mb_strlen()
提问by Ali
I'm trying to make a donation center which I use the source code from Totorialzine.
我正在尝试建立一个捐赠中心，我使用来自 Totorialzine 的源代码。
Everything works fine for me at this moment so far but the only problem I was struggling on and trying to look at for the whole day and can't figure what is actually wrong with the code exactly
到目前为止，目前一切对我来说都很好，但唯一的问题是我一直在努力解决并试图查看一整天，但无法弄清楚代码究竟有什么问题
here is what I get when I submit the comment on the page when my visitors donate.
这是我在访问者捐赠时在页面上提交评论时得到的结果。
Fatal error: Call to undefined function mb_strlen() in /home/yoursn0w/public_html/livetv/premium/thankyou.php on line 14
and here is the code in the php file.
这是php文件中的代码。
<?php
require "config.php";
require "connect.php";
if(isset($_POST['submitform']) && isset($_POST['txn_id']))
{
$_POST['nameField'] = esc($_POST['nameField']);
$_POST['websiteField'] = esc($_POST['websiteField']);
$_POST['messageField'] = esc($_POST['messageField']);
$error = array();
if(mb_strlen($_POST['nameField'],"utf-8")<2)
{
$error[] = 'Please fill in a valid name.';
}
if(mb_strlen($_POST['messageField'],"utf-8")<2)
{
$error[] = 'Please fill in a longer message.';
}
if(!validateURL($_POST['websiteField']))
{
$error[] = 'The URL you entered is invalid.';
}
$errorString = '';
if(count($error))
{
$errorString = join('<br />',$error);
}
else
{
mysql_query(" INSERT INTO dc_comments (transaction_id, name, url, message)
VALUES (
'".esc($_POST['txn_id'])."',
'".$_POST['nameField']."',
'".$_POST['websiteField']."',
'".$_POST['messageField']."'
)");
if(mysql_affected_rows($link)==1)
{
$messageString = '<a href="donate.php">You were added to our donor list! »</a>';
}
}
}
?>
I have my database in the phpMyAdmin uploaded completed
我在 phpMyAdmin 中的数据库上传完成
here is where I follow the instruction of the installation
这是我按照安装说明进行操作的地方
http://tutorialzine.com/2010/05/donation-center-php-mysql-paypal-api/
http://tutorialzine.com/2010/05/donation-center-php-mysql-paypal-api/
回答by AJ.
The function mb_strlen()is not enabled by default in PHP. Please read the manual for installation details:
该功能mb_strlen()在 PHP 中默认不启用。请阅读手册以了解安装详细信息：
回答by Usman
To fix this install the php7.0-mbstring package:
要解决此问题，请安装 php7.0-mbstring 包：
sudo apt install php7.0-mbstring
回答by webmaster
For me the following command did the trick
对我来说，以下命令可以解决问题
sudo apt install php-mbstring
回答by kubanczyk
On Centos, RedHat, Fedora and other yum-my systems it is much simpler than the PHP manual suggests:
在 Centos、RedHat、Fedora 和其他 yum-my 系统上，它比 PHP 手册建议的要简单得多：
yum install php-mbstring
service httpd restart
回答by Mona Jalal
For me, this worked in Ubuntu 14.04 and for php5.6:
对我来说，这适用于 Ubuntu 14.04 和 php5.6：
$ sudo apt-get install php5.6-mbstring
回答by frmbelz
In case Google search for this error
如果 Google 搜索此错误
Call to undefined function mb_ereg_match()
takes somebody to this thread. Installing php-mbstring resolves it too.
把某人带到这个线程。安装 php-mbstring 也可以解决它。
Ubuntu 18.04.1, PHP 7.2.10
Ubuntu 18.04.1，PHP 7.2.10
sudo apt-get install php7.2-mbstring
回答by M_R_K
PHP 7.2 Ubuntu 18.04
PHP 7.2 Ubuntu 18.04
sudo apt install php-mbstring
