I hope this is the right place to put this. But I just made this real quick, was looking for any advice etc? Better ways of doing thing, I'm always looking to improve!

https://github.com/Prashles/Validation

EDIT: Here's the actual class itself.

<?php

Class Validate {

    private $_errors = array();

    public function __construct()
    {
        require_once 'errors.php';
        $this->errorText = $errorText;
    }

    public function rule($value, $name, $inputRules)
    {

        $inputRules = explode('|', $inputRules);
        foreach ($inputRules as $inputRule) {

            if (!strlen($value) && $inputRule != 'required') {
                break;
            }

            if (preg_match('/\[(.*?)\]/', $inputRule, $match)) {

                $rule = explode('[', $inputRule);
                $rule = $rule[0];
                $param = $match[1];
                if (!method_exists($this, $rule)) {
                    throw new Exception("Method {$rule} does not exist");
                    exit;
                }

                $call = array($value, $param);
            }
            else {
                if (!method_exists($this, $inputRule)) {
                    throw new Exception("Method {$inputRule} does not exist");
                    exit;
                }
                $rule = $inputRule;
                $call = array($value);
            }

            $response = call_user_func_array(array($this, $rule), $call);

            if ($response) {
                $error = $this->errorText[$rule];
                $replace = array(
                    ':name' => $name,
                    ':param' => (isset($param)) ? $param : NULL
                );
                $response = str_replace(array_keys($replace), array_values($replace), $error);

                $this->_errors[] = $response;
            }

        }

    }

    public function exec()
    {
        return (empty($this->_errors)) ? false : $this->_errors;
    }

    /*
    * Rule functions
    */

    public function min_length($value, $param)
    {
        return (strlen($value) < $param);
    }

    public function max_length($value, $param) 
    {
        return (strlen($value) > $param);
    }

    public function email($value) 
    {
        return !filter_var($value, FILTER_VALIDATE_EMAIL);
    }

    public function required($value) 
    {
        return (strlen($value) !== 0);
    }

    public function ip($value) 
    {
        return !filter_var($value, FILTER_VALIDATE_IP);
    }

    public function match($value, $param)
    {
        return ($value != $param);
    }

    public function match_exact($value, $param) 
    {
        return ($value !== $param);
    }

    public function match_password($value, $param) 
    {
        return ($value !== $param);
    }

    public function alphanum($value)
    {
        return !ctype_alnum($value);
    }

    public function url($value)
    {
        return !filter_var($value, FILTER_VALIDATE_URL);
    }

    public function numeric($value)
    {
        return !(is_numeric($value));
    }

    public function min($value) 
    {
        return ($value < $param);
    }

    public function max($value) {
        return ($value > $param);
    }

}