Validator Class

<?php

namespace Vendor\App;

class Validator
{
    private array $errors = [];

    public function validate(array $data, array $rules)
    {
        $valid = true;

        foreach ($rules as $item => $ruleset) {
            // $ruleset: required|email|max:5
            // $item: 'email' the key of the assos array
            $ruleset = explode('|', $ruleset);

            foreach ($ruleset as $rule) {
                // $rule: e.g. required
                $colon = strpos($rule, ':');

                $params = '';
                if ($colon != false) {
                    $params = substr($rule, $colon + 1);
                    $rule = substr($rule, 0, $colon);
                }

                $methodName = 'validate' . ucfirst($rule);
                $value = $data[$item] ?? null;
                if (method_exists($this, $methodName)) {
                    /*
                     @params
                     $value: the data that meant to be verified
                     $methodName: e.g validateEmail() method
                    */
                    $this->$methodName($item, $value, $params) OR $valid = false;
                }
            }
        }

        return $valid;
    }

    public function getErrors()
    {
        return $this->errors;
    }

    private function validateRequired($item, $value, $params)
    {
        if (empty($value)) {
            $this->errors[$item][] = 'The ' . $item . ' field is required.';
            return false;
        }

        return true;
    }

    private function validateEmail($item, $value, $params)
    {
        if (!filter_var($value, FILTER_VALIDATE_EMAIL)) {
            $this->errors[$item][] = 'The ' . $item . ' field should be a valid email address.';
            return false;
        }

        return true;

    }

    private function validateMin($item, $value, $params)
    {
        if (strlen($value) < $params) {
            $this->errors[$item][] = 'The ' . $item . ' field should have minimum length of ' . $params . '.';
            return false;
        }

        return true;
    }
}