How to Add PHP Form Validations Easily

How to Add PHP Form Validations Easily

PHP Form validations are very important while submitting/accepting data through forms, without these validations’ users can submit any kind of information through the form. And if the user submits invalid data, then the data won’t be useful. For not to get the obsolete data, we should add Form Validations. Once you learn how to add PHP Validations, you can easily add these validations to any form.

Let’s get into working on adding the form validations.

Accessing the Values Submitted through Form

We can access the values submitted through the form with POST superglobal because I’m using the POST method in form opening tag from the previous step. That is What You Should Know about Forms for Developers if you have any doubts about how to use the POST method and the differences between the POST method, GET method. Please go through the article and also the video.

Adding PHP Form Validations

Adding PHP Form Validations is simple, just we need to check whether the submitted value is empty or not. Here I’m only adding validations to check the input field is required. You can add validations for checking the submitted value is email or submitted value meets certain conditions with regular expressions. You can add these Form Validations for any kind of purpose.

Let’s get into adding validations for our input fields for the form from the previous step.

Adding Validations for Input text Fields

Adding Form Validations is similar for any kind of input fields, but there are few minor differences you should know. For input type text fields, we will just check whether the submitted value is empty or not. If the submitted value is empty, we will display an error message or else we will proceed to the next step. That is uploading a file or inserting the values into the database table.

Adding Validations for Radio buttons

For radio buttons, we will pass the values along with the radio button. But the user has to select the radio button, by default we can add checked attribute to the radio. If we add checked attribute one of the radio buttons will be selected and the value will be passed.

In case, if the checked attribute is not passed then the user has to select the radio button by himself. If he has not selected, then he will get an error message.

Adding Validations for Select List

In the select list, that is for every option tag we should add value attribute. Once the user selects an option from the dropdown list. The value will be passed associated with the option tag. If you want to add the validations for the select list, you have to pass an empty value attribute for the default option tag.

Why You Should use PHP Form Validations instead of HTML5 Validations

PHP Form Validations are more secure than HTML5 Validations, anyone with a little bit of coding knowledge can bypass the HTML5 Validations. Bypassing or skipping the PHP Form Validations is not possible, because these validations are executed on the server-side end. HTML 5 validations are client-side, that is these HTML5 Validations are checked only in the browser. So, it’s easy to manipulate HTML5 Validations.

Until all the conditions are met in the PHP Form validations on the server end, it won’t allow proceeding with the next steps. That is uploading files or inserting the records into the database.

Complete Code of Form Validations

Here is the complete code for adding PHP Form Validations to your forms, as I said earlier in this article you can replicate the same concept to other forms that you want to add PHP Form Validations.

Conclusion

Adding Form Validations is a very important step for any form. Instead of relying on client-side form validations, that is HTML5 validations or JavaScript / jQuery Form validations, It’s always secure to User Server-Side Form Validations like PHP programming.

The next step in this series is displaying these validation error messages after submitting the form.

If you have any questions, feel free to ask in the comments section here or in the YouTube Comments Section.

Vivek Vengala
 

Vivek Vengala is a Online Entrepreneur, Web Developer from Hyderabad India.

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