PHP for begginers. Avoid duplicate code in PHP and MySql

PHP MySqL for begginers. Avoid duplicate code in PHP and MySql
The problem with the previous code is that it will have to drop out of PHP and
duplicate the form code in three different places (once for each validation error). We
can use a true/false variable known as a flag to keep track of whether or not
we need to output the form. Let’s call it $output_form. Then we can check the
variable later in the code and display the form if the variable is true.
Additional materials page code in the archive on Google Drive at the link.

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