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Asked: 2026-06-17T08:42:24+00:00

Months ago I made a short code that uses mb_strimwidth() to exactly fit some

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Months ago I made a short code that uses mb_strimwidth() to exactly fit some text into a table cell, putting dots at the end of a truncated string.
Now, after some times, I tried to execute that same code and it went out with this error:

Fatal error: Call to undefined function mb_strimwidth() in ...

I tried to find the mbstring.php file, and when I found the mb_strimwidth() function, I discovered that it is not implemented anymore. How is that possible?
But my main question is: how can I get the same result as mb_strimwidth()?
I thought to rewrite the function using a loop and mb_strwidth(), but ALL the functions in that mbstring.php file are empty.

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1 Answer

  1. Editorial Team

    All mb_* functions are provided by a PHP extension called Multibyte String, internal name mbstring

    You probably don’t have the extension active or installed. On most Linux distros you can install the package php-mbstring to install and activate this extension.

    Apache needs to be restarted afterwards if you are using mod_php

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