Validation Library

Introduction

This is a comprehensive validation library for PHP, providing various methods to validate different types of data against specified rules.

Installation

Ensure you have Composer installed. You can install the library using Composer by running:

composer require codecorners/validation

Usage

1. Require Composer's Autoload File

   Make sure to include Composer's autoload file at the beginning of your script:

   require_once 'vendor/autoload.php';

2. Use the Validation Class

   Use the Validation class from the CodeCorner\Validation namespace in your script:

   use CodeCorner\Validation\Validation;

3. Perform Validation

   Define your validation rules and validate your data using the validate method of the Validation class:

   Validation::validate([
       'name'  => 'required|min:3',
       'email' => 'required|email',
       'age'   => 'numeric|min:18',
       'url'   => 'URL',
       'phone' => 'phone',
       'amount' => 'decimal',
       'role'  => 'in_array:admin,moderator,user',
       'username' => 'unique:users',
       'password' => 'nullable|string|min:6',
   ], [
       'name' => 'John Doe',
       'email' => 'john@example.com',
       'age' => 25,
       'url' => 'https://example.com',
       'phone' => '+1234567890',
       'amount' => 123.45,
       'role' => 'admin',
       'username' => 'johndoe',
       'password' => null,
   ]);

   In this example:

   • name is required and must be at least 3 characters long.
   • email must be a valid email address.
   • age must be numeric and at least 18.
   • url must be a valid URL.
   • phone must be a valid phone number.
   • amount must be a decimal number.
   • role must be one of: admin, moderator, or user.
   • username must be unique (e.g., not already taken in a database).
   • password is nullable (optional) and if provided, must be a string of at least 6 characters.

4. Available Validation Methods

   Here are the available validation methods and their usage:

   • required: The field must be present and not empty.
   • string: The field must be a string.
   • numeric: The field must be numeric.
   • in_array:val1,val2,...: The field must be one of the specified values.
   • array_required: The field must be an array and not empty.
   • file: The field must be a file upload. // 'size.5000000&type.png,jpeg&name.jpeg,png'
   • min:value: The field must be at least value characters long (for strings) or numeric value.
   • max:value: The field must be at most value characters long (for strings) or numeric value.
   • nullable: Allows the field to be null or empty.
   • unique:table,column: Checks if the field value is unique in a specified database table and column.
   • email: The field must be a valid email address.
   • URL: The field must be a valid URL.
   • regex:pattern: The field must match the specified regular expression pattern.
   • not_in:val1,val2,...: The field must not be one of the specified values.
   • in:val1,val2,...: Alias for in_array.
   • phone: The field must be a valid phone number.
   • decimal: The field must be a valid decimal number.

5. Retrieve Validation Errors

   After performing validation, you can retrieve any validation errors using the getErrors method:

   $errors = Validation::getErrors();
   print_r($errors);

   This will output an array of validation errors encountered during the validation process.

6. Using Database level validation

   • add your DB object in the config.php file.

      Validation::dbConfigure(self::$pdo);

   then you will use database level validation

   <?php
   
   require_once 'vendor/autoload.php';
   
      use CodeCorner\Validation\Validation;
   
      Validation::validate([
         'name'  => 'required|min:3',
         'email' => 'required|unique:`tablename`.`fieldname`',
         'phone' => 'phone|not_in:`tablename`.`fieldname`,`fieldname`-`value`',
         'role'  => 'in:`tablename`.`fieldname',
         'username' => 'assign:`tablename`.`fieldname`',
         
      ], [
         'name' => 'John Doe',
         'email' => 'john@example.com',
         'phone' => '+1234567890',
         'role' => 'admin',
         'username' => 'johndoe',         
      ]);
   
      $errors = Validation::getErrors();
      print_r($errors);

Example

Here's a complete example of how you might use this library:

<?php

require_once 'vendor/autoload.php';

use CodeCorner\Validation\Validation;

Validation::validate([
    'name'  => 'required|min:3',
    'email' => 'required|email',
    'age'   => 'numeric|min:18',
    'url'   => 'URL',
    'phone' => 'phone',
    'amount' => 'decimal',
    'role'  => 'in_array:admin,moderator,user',
    'username' => 'unique:users',
    'password' => 'nullable|string|min:6',
], [
    'name' => 'John Doe',
    'email' => 'john@example.com',
    'age' => 25,
    'url' => 'https://example.com',
    'phone' => '+1234567890',
    'amount' => 123.45,
    'role' => 'admin',
    'username' => 'johndoe',
    'password' => null,
]);

$errors = Validation::getErrors();
print_r($errors);

In this example:

• We include Composer's autoload file.
• Define various validation rules for different fields.
• Validate the provided data against these rules.
• Print any validation errors encountered.