![]() This function protects the code from attackers. We have also added an if else statement for each POST variable. Htmlspecialchars() converts special characters such as “&”(ampersand) into HTML entities “&”. This chapter shows how to make input fields required and create error messages if needed. ![]() When the user submits the form, the four text boxes need to be filled. ![]() Four of these are text fields, the other four are list boxes. This means that the error messages and data in the form can be displayed on the same page as shown in the output above. I have eight input fields in my form that I need to check whether they are empty. $_SERVER variable is responsible for sending the form data submitted to the page itself. Let us begin by understanding some variables and functions used in the code. Recently, I was asked by one of our bank website design clients to come up with a way to make one set of input fields required if a particular radio button was. Now that you have the code for the PHP form, you need to understand the different parts of the code used for the validation process. In PHP we have the following conditional statements: if statement - executes some code if one condition is true if. Now, if the correct details are entered, no error is displayed. What you are looking for is a conditional rule, which gives you finer control of when to perform a check, e.g. Next up, first, give incorrect details and see what the output will be. Your rule performs two checks that are independent of one another just because the externalid field is not required when the typeid 3, does not mean the integer check is ignored. In the example you provide, password, topic and outline would all be strings.In programming, any collection of text is considered a string, and in strongly-typed languages its usually a data type used for text. $_SERVER: This is also a super global variable that returns the request method used to access the page. $_POST: It is a superglobal variable in PHP, which is used to collect data submitted in the form. ![]() Some essential variables used in the code: The following code will create a form with the fields mentioned above and also validate the form. The if else statements have also been added for each of the POST variables. How to Write the Code for PHP Form Validation? Error messages will be stored in these error variables corresponding to the required fields. Now create an HTML form with the above fields. On the registration page, the gender field will be presented as a select option, and hence the requirement is set as “Must select one” while the comment field is a text field and there’s no requirement set for it. The table shows the field’s name the requirement set for the field (the page will return an error if the requirement for the respective field is not met), and its type, i.e., if it is a required field or not. ![]()
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