If you’re using MySQL 5.6.1 or higher you can use the FROM_BASE64() function. You can write your query inside file like :
$query = mysqli_query($connection,"SELECT testid, setno, qnid, FROM_BASE64(question) as question FROM `table_name`");
SQL Query
SELECT testid, setno, qnid, FROM_BASE64(question) as question FROM `table_name`
Hope it will help you.
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solved base64 encoded column want to decode using a xampp server what [closed]