Cool validation module

example.php

<?php

require 'validation.php';

/** An example, validate the given data with given rules */

$data = [
    'username'   => 'voteforpedro',
    'password'   => '123456',
    'confirm'    => '123456',
    'name'       => 'Pedro',
    'lastname'   => 'Dynamite',
    'status'     => 'President',
    'phone'      => '1(800)-800-8000',
    'mail'       => 'voteforpedro@gmail.com',
    'day'        => '2',
    'month'      => '1992',
    'year'       => '3',
    'education'  => 'Something',
    'experience' => 'Hello',
    'occupation' => 'Russia',
    'gender'     => '1',
    'extra'      => ''
];

$rules = [
    'username'   => 'required|is_alpha_dash',
    'password'   => 'required|confirm:confirm',
    'name'       => 'required',
    'lastname'   => 'required',
    'status'     => 'required',
    'phone'      => 'required|is_phone_number',
    'mail'       => 'required|is_email',
    'day'        => 'required|is_number',
    'month'      => 'required|is_number',
    'year'       => 'required|is_number',
    'education'  => 'required',
    'experience' => 'required',
    'occupation' => 'required',
    'gender'     => 'required|is_boolean',
    'extra'      => ''
];

$errors = validate($data, $rules);

if (!$errors) {
    echo 'Valid';
}
else {
    var_dump($errors);
}

validation.php

<?php

/** Validators */

function required ($value) {
    return !!$value;
}

function confirm ($value, $array, $field) {
    return (string)$value === (string)$array[$field];
}

function is_phone_number ($value) {
    return strlen(preg_replace('/[^\d]/', '', $value)) <= 11;
}

function is_number ($value) {
    return is_numeric($value);
}

function is_email ($value) {
    return strpos($value, '@') !== false;
}

function is_alpha_dash ($value) {
    return !!preg_match('/^[\w\d\-\_]+$/', $value);
}

function is_boolean ($value) {
    return $value == 1 || $value == 0;
}

/**
 * Functions
 */

/**
 * @param array $data
 * @param array $rules
 * @param array $validators
 * @return array
 */
function validate (array $data, array $rules) {
    $errors = [];
    
    foreach ($rules as $key => $rule) {
        $error = validate_field($data[$key], $rule, $data);
        
        if ($error) {
            $errors[$key] = $error;
        }
    }
    
    return $errors;
}

/**
 * @param mixed $value
 * @param array|string $rule
 * @param arary $data
 * @return array
 */
function validate_field ($value, $rule, array $data = []) {
    $rule = parse_rule($rule);
    $errors = [];
    
    foreach ($rule as $validator => $args) {
        $vargs = array_merge([$value, $data], $args);
        
        if (!call_user_func_array($validator, $vargs)) {
            $errors[$validator] = $args;
        }
    }
    
    return $errors;
}

/**
 * @param string $rule
 * @return array
 */
function parse_rule ($rule) {
    $rule = !$rule ? [] : $rule;
    
    if (is_array($rule)) {
        return $rule;
    }
    
    $result = [];
    $rules  = explode('|', $rule);
    
    foreach ($rules as $rule) {
        $frags = explode(':', $rule);
        
        $name = $frags[0];
        $args = isset($frags[1]) ? explode(',', $frags[1]) : [];
        
        $result[$name] = $args;
    }
    
    return $result;
}

awesome

Thanks! :)