This is used to still support older versions of Laravel's usage of mcrypt.
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Download thread safe DLL file from https://pecl.php.net/package/mcrypt website. Make sure to pick which one is compatible with your PHP version.
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Extract files and copy the file php_mcrypt.dll
xampp/php/ext
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Edit
xampp/php/php.ini
and add the following line after where all the extensions are listed.