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The PHP Validation script is a set of validation rules which lets you add server-side validation to your forms quickly and with as little effort as possible.
The script checks the values that a user has entered into your form, and if it doesn’t meet the criteria specified (e.g.
Then, the if (isset($_POST["submit"])) test returns true, and it executes the code in that if-block.
Each rules = “…” line adds a new validation rule into the rules list.
These errors are then outputted to the page for the user to fix.You may opt for sending form data to a different file.Validation for non-empty, alphabets and whitespace only The following code is added within the form So, if you try to understand how to write code for it step by step, step 1 is to declare the mail address to whom you want to send mail, step 2 is to write subject of the mail, step three is to collect data from POST so that you can write them to the body of mail, step 4 is to declare the mail id from which the mail is coming and finally sent mail with PHP mail() function.if all the fields are filled then only the insert into should come into act.This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, Math ML, etc.
Each of the validation rules are all of the following form: The square bracket  notation indicates that the contents are optional.