How to check form validation in php

Today, I will discuss regarding form validation in core PHP. when the user submitted the form at that time required for input field validation. there are two types of validation, first is server side and second is client side. see below example of server-side validation.

php_form_validation

Required field, email validation and number required .. etc I will give validation information by our post.

See below code, that is an array wise creating a form validation, whenever error generate at that time count error array element, if count greater than 0, we are showing the error message.

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