CodeIgniter Form Validation Email - PHP

Form validation is an essential part of any web application development. In CodeIgniter, the form validation process is straightforward and easy to implement. In this tutorial, we are going to learn about form validation for email fields in CodeIgniter using the built-in Form Validation Library.

Getting Started

First, we need to load the Form Validation Library in our controller. This can be achieved by calling the $this->load->library('form_validation'); method in the constructor of our controller. Once the library is loaded, we can call the $this->form_validation->set_rules(); method to set validation rules for our form fields.

Setting Validation Rules for Email Fields

To set validation rules for an email field, we need to call the $this->form_validation->set_rules('field_name', 'Field Label', 'rules'); method. Here is an example:

$this->form_validation->set_rules('email', 'Email', 'required|valid_email');

In the above example, we are setting validation rules for an email field named "email". The "Email" argument specifies the field label that will be displayed in the validation error message. We are also setting two validation rules using the "required" and "valid_email" arguments. The "required" rule specifies that the field must not be empty, while the "valid_email" rule specifies that the field must contain a valid email address.

Validating Email Fields

To validate the email field, we need to call the $this->form_validation->run(); method. This method will return a boolean value indicating whether the validation passed or failed. If the validation failed, we can use the $this->form_validation->set_message(); method to set a custom error message for the email field. Here is an example:

if ($this->form_validation->run() == FALSE) {
    $this->form_validation->set_message('valid_email', 'The {field} field must contain a valid email address.');
}

In the above example, we are setting a custom error message for the "valid_email" rule. The "{field}" argument will be replaced with the field label specified in the $this->form_validation->set_rules(); method.

Conclusion

In this tutorial, we learned about form validation for email fields in CodeIgniter using the built-in Form Validation Library. We covered how to set validation rules for email fields, how to validate email fields, and how to set custom error messages for email fields. By applying the knowledge gained in this tutorial, you can easily implement form validation for email fields in your CodeIgniter web application.