This function protects the code from attackers. I have a form that is currently working but want to add php code to the 'post' file so some fields in the html form are required otherwise a message displays. Htmlspecialchars() converts special characters such as “&”(ampersand) into HTML entities “&”. If the variable is not set, an error message will be displayed. The isset function checks if a variable is set and is not NULL. This means that the error messages and data in the form can be displayed on the same page as shown in the output above. To validate required fields with PHP, we will use the isset function. $_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. 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. Now, if the correct details are entered, no error is displayed. What I need is if one answer is checked it makes the other field required. I do not need to show or hide fields however. And here is the php code example that goes into the functions.php file. Next up, first, give incorrect details and see what the output will be. I know this might be considered off topic but I am not sure where else to post this as it also pertains to WordPress. $_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: In PHP we have the following conditional statements: if statement - executes some code if one condition is true if. The following code will create a form with the fields mentioned above and also validate the form. How to Write the Code for PHP Form Validation? Lets say we have the following scenario: If the post status is draft only the title is required, and if the status is published. In this tutorial, I will show you 4 different Laravel syntax examples to achieve it. Now create an HTML form with the above fields. When validating forms or API requests, sometimes the rule for one field depends on values from other fields. + Must only contain letters and whitespace. These fields can’t be vacant and must be rounded out in the HTML structure. 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. From the approval rules table on the past page, we see that the Name, Email, and Gender fields are required. PHP features an if structure that is similar to that of C: As described in the section about expressions, expression is evaluated to its Boolean value. It allows for conditional execution of code fragments. 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. The if construct is one of the most important features of many languages, PHP included.
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