php form validation before submit

PHP Form Validation - W3Schools Following is the form code:

... However, client-side validation doesn’t prevent malicious users from submitting data that can potentially exploit the application. How to Validate Form Using PHP Before validating the form, You have to set the following basic requirements. The validation code of each input field is written within a custom function. So that you can easily use it to validate the form before or after submission. You have to validate the First Name Input using the following Validation rule – A First Name must not be empty. You have to validate the Last Name Input using the following Validation rule – How do I submit a form's data automatically after successful PHP ... Form Une validation appropriée des données de formulaire est important de protéger votre forme contre les pirates et les spammeurs! Add either .was-validated or .needs-validation to the element, depending on whether you want to provide validation feedback before or after submitting the form. I am using javascript to do the validations. For this specific problem I prefer to submit the form to a different page. Form Validation with PHP - SitePoint

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