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07-Oct-2020 16:47

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Of course, validating user input is really important for dynamic websites. In this tutorial, you will learn about 4 major tasks.

The awesome language, PHP has numerous in-built functions to validate user inputs.

The simplest change you can make to your forms is to mark a text input field as 'required': This informs the (HTML5-aware) web browser that the field is to be considered mandatory.

Different browsers may mark the input box in some way (Firefox 4 Beta adds a red box-shadow by default), display a warning (Opera) or even prevent the form from being submitted if this field has no value.

If you are interested in autoloading classes, you can check our tutorial.

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I assume that you have basic knowledge on Object Oriented Programming. Our class must prevent XSS attacks and validate inputs.The option of using pure HTML, sometimes with a touch of CSS, to complement Java Script form validation was until recently unthinkable.Sure there have been all kinds of whacky plug-ins over the years aimed at achieving this, but never a single standard that we could work towards.This method can be used to validate any integer value such as a primary integer key (user Id, group Id, etc.) in database, timestamp, etc.

The advantage of using this function is, it converts string numbers ( function.

If you are sending sensitive data such as passwords, emails with HTTP request you must use POST. But, if the email is compulsory, we have to throw an error if it's empty.

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