Backend CodeIgniter Validation

When to use this skill

• Validating user input
• Custom validation rules
• Form validation
• API request validation

Workflow

• ] Define validation rules
• ] Use in controllers or models
• ] Create custom rules
• ] Return validation errors
• ] Localize error messages

Instructions

Controller Validation

php
<?php

public function create()
{
    $rules = [
        'email' => 'required|valid_email|is_unique[users.email]',
        'password' => 'required|min_length[8]',
        'name' => 'required|min_length[3]'
    ];

    if (!$this->validate($rules)) {
        return $this->fail($this->validator->getErrors());
    }

    // Process valid data
}

Custom Rule

php
<?php

// Config/Validation.php
public function strong_password(string $password): bool
{
    return preg_match('/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,}$/', $password);
}

Resources

• Validate all user input
• Use built-in rules
• Create custom rules when needed