Fatal error: Call to undefined function mb_strlen()
PhpPhp Problem Overview
I'm trying to make a donation center which I use the source code from Totorialzine.
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
here is what I get when I submit the comment on the page when my visitors donate.
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.
<?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
here is where I follow the instruction of the installation
http://tutorialzine.com/2010/05/donation-center-php-mysql-paypal-api/
Php Solutions
Solution 1 - Php
The function mb_strlen() is not enabled by default in PHP. Please read the manual for installation details:
Solution 2 - Php
To fix this install the php7.0-mbstring package:
sudo apt install php7.0-mbstring
Solution 3 - Php
For me the following command did the trick
sudo apt install php-mbstring
Solution 4 - Php
On Centos, RedHat, Fedora and other yum-my systems it is much simpler than the PHP manual suggests:
yum install php-mbstring
service httpd restart
Solution 5 - Php
For me, this worked in Ubuntu 14.04 and for php5.6:
$ sudo apt-get install php5.6-mbstring
Solution 6 - Php
In case Google search for this error
Call to undefined function mb_ereg_match()
takes somebody to this thread. Installing php-mbstring resolves it too.
Ubuntu 18.04.1, PHP 7.2.10
sudo apt-get install php7.2-mbstring
Solution 7 - Php
PHP 7.2 Ubuntu 18.04
sudo apt install php-mbstring
Solution 8 - Php
This worked for me on Debian stretch
sudo apt-get update
sudo apt install php-mbstring
service apache2 restart
Solution 9 - Php
This question looks to be in relation to PHP on Unix. However, for anyone getting to this question for PHP on Windows, see https://www.php.net/manual/en/install.pecl.windows.php.
Since multi-byte string support is a core PHP extension, all that is necessary on Windows is to uncomment this line in your php.ini:
extension=php_mbstring.dll