Looping through columns and conditionally updating their values with MySQL and PHP?

If samaccountname is a unique key, you can insert a new record or update an existing one like this.

You cannot loop through a PHP array using MySQL. You can create a very sophisticated query, via looping thourgh arrays in PHP, and then execute that query, or you can get the whole db table to an array, then loop through that array, make necessary changes to it and then loop it again and update the changed parts of the table.

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