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Home/ Questions/Q 7645129
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Editorial Team
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Editorial Team
Asked: May 31, 20262026-05-31T09:51:41+00:00 2026-05-31T09:51:41+00:00

I get this error: PHP Fatal error: Call to undefined function mb_strpos() in /my/file.php

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I get this error:

PHP Fatal error:  Call to undefined function mb_strpos() in /my/file.php

Which is odd because mb_strpos() was introduced in PHP 4, and I’m running PHP 5.3.3

$ php -v
PHP 5.3.3 (cli) (built: Feb 22 2012 19:38:14) 
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies

Anybody else run into something like this and know how to fix it? I searched and I can’t figure it out.

PS. I’m running centOS 5.

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  1. Editorial Team
    Editorial Team
    2026-05-31T09:51:42+00:00Added an answer on May 31, 2026 at 9:51 am

    MBString is not a default extension in PHP and you have to install it
    if you are running linux try

    yum install  php-mbstring.x86_64 # for RedHat derivative systems
    

    as a root user
    or

    apt-get install php-mbstring.x86_64 # for Debian derivative systems
    

    on windows you have to edit php.ini to use the extension dll library

    Note: mb_strpos still supported in PHP 5

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