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I am trying to do a composer install ..., but getting an error of requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. I am using Apache (Cpanel) and PHP 5.6.

Below are the ways I am trying to fix the error.

1: yum search mbstring

============================================= N/S matched: mbstring =============================================
ea-php54-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
ea-php55-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
ea-php56-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
ea-php70-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
ea-php71-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
ea-php72-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
rh-php56-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
rh-php70-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling
rh-php71-php-mbstring.x86_64 : A module for PHP applications which need multi-byte string handling

2: yum install ea-php56-php-mbstring.x86_64

Loaded plugins: fastestmirror, universal-hooks
Loading mirror speeds from cached hostfile
 * EA4: 110.4.45.120
 * cpanel-addons-production-feed: 110.4.45.120
 * base: ftp.cuhk.edu.hk
 * centosplus: ftp.cuhk.edu.hk
 * epel: ftp.cuhk.edu.hk
 * extras: ftp.cuhk.edu.hk
 * ius: hkg.mirror.rackspace.com
 * updates: ftp.cuhk.edu.hk
Package ea-php56-php-mbstring-5.6.35-1.1.5.cpanel.x86_64 already installed and latest version
Nothing to do

It seems mbstring is installed but why I got an error when I try to composer install?

Another way (update PHP version in cPanel)

1: WHM – already set to 7.1

enter image description here

2: cPanel – already set to 7.1

enter image description here

but version in server still 5.6

enter image description here

Any suggestions to resolve require ext-mbstring error?

5

Answers


  1. Chosen as BEST ANSWER

    Installing rh can solve this issue yum install rh-php56-php-mbstring.x86_64

    Please double check what you have in your server. Mine is rh-php56-php-mbstring.x86_64 not php-mbstring


  2. Use this command to install mbstrig

     yum install php-mbstring
    

    Once installed restart apache

     service httpd restart
    
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  3. Try installing mbstring php library with aptitude.

    sudo apt-get install php-mbstring php7.1-mbstring
    
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  4. If there are no deeper dependencies down the line, you could use a polyfill instead: edit the composer.json and replace the problem line with "symfony/polyfill-mbstring": "~1.0"

    https://packagist.org/packages/symfony/polyfill-mbstring

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  5. I recently had a similar issue when trying to run a build for my PHP WordPress site. I ended up updating the composer.json with the snippet below in the require section:

    # composer.json
    # ...
    
    "require": {
      "ext-mbstring": "*", # <-- I've added this
      "ext-gd": "*",
      "php": "7.*",
      "wordpress/wordpress": "*",
    
      # ...
    
    }
    

    Hopefully this can become useful to others in the future!

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