Composer Fatal error: Call to undefined function Symfony\Polyfill\Mbstring\iconv() in phar

Fatal error: Call to undefined function Symfony\Polyfill\Mbstring\iconv() in phar

This error typically occurs when the iconv function from the Symfony\Polyfill\Mbstring namespace is not available. To resolve this issue, you can try the following steps:

  1. Make sure the mbstring extension is enabled in your PHP configuration. You can check this by creating a PHP file with the following code and accessing it in your browser:

php <?php phpinfo();

Look for the mbstring section in the PHP info page to verify if the extension is enabled.

  1. If the mbstring extension is not enabled, you can enable it by modifying your PHP configuration file (php.ini). Locate the php.ini file and uncomment the line that starts with extension=mbstring. Then, restart your web server to apply the changes.

  2. If the mbstring extension is already enabled, it's possible that the Symfony\Polyfill\Mbstring package is not installed or is not being autoloaded correctly. You can try reinstalling the package using Composer by running the following command in your project directory:

bash composer require symfony/polyfill-mbstring

This command will install the package and update your composer.json file with the necessary dependencies.

  1. If the issue persists, you can try clearing the Composer cache by running the following command:

bash composer clear-cache

After clearing the cache, try running composer install or composer update again to see if the error is resolved.

If none of the above steps resolve the issue, it might be helpful to provide more information about your Symfony and Composer versions, as well as any relevant code snippets or error messages you are encountering.