Validating addresses php

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There are a large number of reserved ranges of IP addresses.In this article you’ll construct and validate a simple form using HTML and PHP.If it has not been submitted, bypass the validation and display a blank form.So far, we have a largely HTML page which defines the form; the only PHP so far is to specify the form’s action value.Note that HTML email address validation will only work in browsers that support HTML5 and validate form element input.For other browsers and backup, you can still validate email addresses using PHP, for example.Any errors or omissions will be highlighted with a message alongside the relevant field. The purpose of the form is to capture user details (name, address, and email) to obtain feedback (on fruit consumption and favorite fruit) and request a brochure. There are two specific attributes that need to be set in the form tag, .

Any fields already completed will be left unchanged, allowing the user to simply adjust her input and re-submit the form without having to enter all of the data again. Let’s look at the PHP required for validating the form.

This is added to the flags passed with the | bitwise operator.

For example: From my own testing I have discovered that combining FILTER_FLAG_IPV4 and FILTER_FLAG_IPV6 (i.e.

To validate an IPv4 address but not allow private range addresses to be included (e.g.

192.168.1.1) then use the FILTER_FLAG_NO_PRIV_RANGE flag as well.

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