Validx

A lightweight and extensible PHP validation library.
Validx provides a simple and readable way to validate data in PHP projects.

Features (v1)

• Basic validation rules: required, email, min, max, between, numeric, integer, phone, url, secure, unique, in, alphanumeric, date, fileType, maxfileSize.
• Supports arrays and nested fields.
• Optional PDO database injection for rules like unique.
• Integration-ready for forms, APIs, and any PHP project.

Quick Start

use Validx\Validation;

$validation = new Validation();

$data = [
    'username' => 'exampleuser',
    'email' => '[email protected]',
];

$rules = [
    'username' => 'required | between:2,15',
    'email' => 'required | email',
];

$errors = $validation->validate($data, $rules);

if (!empty($errors)) {
    print_r($errors);
} else {
    echo "All fields are valid!";
}

## Example Error Output

```php
[
    'username' => ['The username must have between 2 and 15 characters'],
    'email' => ['The email already exists'],
]

Available Rules (v1)

• required
• email
• min
• max
• between
• numeric
• integer
• phone
• url
• secure
• unique
• in
• alphanumeric
• date
• fileType
• maxfileSize

Writing Validation Rules

Note: All keys defined in your validation rules must exist in the input data array.

Validation rules are defined as strings using pipe | separators. You can combine multiple rules per field.

Examples:

$rules = [
    'username' => 'required | between:3,20',
    'email' => 'required | email | unique:email',
    'password' => 'required | min:6 | max:12 | secure',
    'age' => 'integer | min:18',
];

required — The field must not be empty.

email — Must be a valid email address.

unique:email — Must be unique in the database (requires PDO).

min:value / max:value — Minimum or maximum length/value.

between:min,max — Value must be within the given range.

integer — Must be an integer.

secure — Must meet password security criteria

Error Messages

Validx returns error messages from an internal enum class.
Currently, messages are not customizable, but each rule has a predefined message.

Available Messages Per Rule

Rule	Default Message
REQUIRED	Please Enter The %s
EMAIL	The %s is not a valid email address
MIN	The %s must have at least %s characters
MAX	The %s must have at most %s characters
BETWEEN	The %s must have between %d and %d characters
SAME	The %s must match with %s
ALPHANUMERIC	The %s should have only letters and numbers
SECURE	The %s must have between 8 and 64 characters and contain at least one number, one upper case letter, one lower case letter and one special character
UNIQUE	The %s already exists
NUMERIC	The %s must contain only numbers
INTEGER	The %s must be an integer
URL	The %s is not a valid URL
DATE	The %s is not a valid date
PHONE	The %s is not a valid phone number
IN	The %s must be one of the allowed values
FILETYPE	The %s must be a valid file type: %s
MAXFILESIZE	The %s must not be larger than %s

Note: %s and %d are placeholders that will be replaced with field names, min/max values, or file size as appropriate.