Fatal error Call to undefined function mb strlen

Question

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    lt  php  require  config php   require  connect php    if isset   POST  submitform     amp  amp  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   lt 2                 error      Please fill in a valid name               if mb strlen   POST  messageField    utf-8   lt 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   lt br   gt    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     lt a href  donate php  gt You were added to our donor list   amp raquo  lt  a gt                         gt    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

User · Accepted Answer

The function mb strlen   is not enabled by default in PHP   Please read the manual for installation details   http   www php net manual en mbstring installation php

User · Answer

PHP 7 2 Ubuntu 18 04  sudo apt install php-mbstring

User · Answer

For me the following command did the trick  sudo apt install php-mbstring

User · Answer

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

User · Answer

To fix this install the php7 0-mbstring package   sudo apt install php7 0-mbstring

User · Answer

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

User · Answer

For me  this worked in Ubuntu 14 04 and for php5 6     sudo apt-get install php5 6-mbstring

User · Answer

This worked for me on Debian stretch sudo apt-get update sudo apt install php-mbstring service apache2 restart

[php] Fatal error: Call to undefined function mb_strlen()

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