validate.php

<?php

if ( ! class_exists('Validate') ) {
	class Validate {

		/**
		 * Check if the value is present.
		 * 
		 * @param  mixed  $value
		 * @return boolean
		 */
		public function required($value)
		{
	        $value = preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u', '', $value);
	        return ! empty( $value );
		}

		/**
		 * Check if the value is formatted as a valid URL.
		 * 
		 * @param  string  $value
		 * @return boolean
		 */
		public function url($value)
		{
			return filter_var($value, FILTER_VALIDATE_URL) !== false;
		}

		/**
		 * Check if the value is a valid email.
		 * 
		 * @param  string  $value
		 * @return boolean
		 */
		public function email($value)
		{
			return filter_var($value, FILTER_VALIDATE_EMAIL) !== false;
		}

		/**
		 * Check if the value is an integer, including
		 * numbers within strings. 1 and '1' are both classed as integers.
		 * 
		 * @param  string  $value
		 * @return boolean
		 */
		public function int($value)
		{
			return is_numeric($value) && (int)$value == $value;
		}

		/**
		 * Check if the value is a number, including numbers within strings.
		 * 
		 * Numeric strings consist of optional sign, any number of digits,
		 * optional decimal part and optional exponential part.
		 * Thus +0123.45e6 is a valid numeric value.
		 * Hexadecimal (e.g. 0xf4c3b00c),
		 * Binary (e.g. 0b10100111001),
		 * Octal (e.g. 0777) notation is allowed too
		 * but only without sign, decimal and exponential part.
		 * 
		 * @param  string  $value
		 * @return boolean
		 */
		public function number($value)
		{
			return is_numeric($value);
		}

		/**
		 * Check if the value is alphabetic letters only.
		 * 
		 * @param  string  $value
		 * @return boolean
		 */
		public function alpha($value)
		{
			return (bool) preg_match('/^[\pL\pM]+$/u', $value);
		}

		/**
		 * Check if the value is alphanumeric.
		 * 
		 * @param  string  $value
		 * @return boolean
		 */
		public function alnum($value)
		{
			return (bool) preg_match('/^[\pL\pM\pN]+$/u', $value);
		}

		/**
		 * Check if the value is alphanumeric.
		 * Dashes and underscores are permitted.
		 * 
		 * @param  string  $value
		 * @return boolean
		 */
		public function alnumdash($value)
		{
			return (bool) preg_match('/^[\pL\pM\pN_-]+$/u', $value);
		}

		/**
		 * Check if the value is an array
		 * 
		 * @param  array  $value
		 * @return boolean
		 */
		public function array($value)
		{
			return is_array($value);
		}

		/**
		 * Check if string length is greater than or equal to given int.
		 * To check the size of a number, pass the optional number option.
		 * 
		 * @param  mixed  $value
		 * @param  integer  $min_value
		 * @param  boolean  $is_number
		 * 
		 * @return boolean
		 */
		public function min($value, $min_value, $is_number = false )
		{
	        if ($number) {
	            return (float) $value >= (float) $min_value;
	        }

	        return mb_strlen($value) >= (int) $min_value;
		}

		/**
		 * Check if string length is less than or equal to given int.
		 * To check the size of a number, pass the optional number option.
		 * 
		 * @param  mixed  $value
		 * @param  integer  $max_value
		 * @param  boolean  $is_number
		 * 
		 * @return boolean
		 */
		public function max($value, $max_value, $is_number = false )
		{
	        if ($number) {
	            return (float) $value <= (float) $max_value;
	        }

	        return mb_strlen($value) <= (int) $max_value;
		}

		/**
		 * Checks if the value is within the intervals defined.
		 * This check is inclusive, so 5 is between 5 and 10.
		 * 
		 * @param  mixed  $value
		 * @param  integer  $min_value
		 * @param  integer  $max_value
		 * 
		 * @return boolean
		 */
		public function between($value, $min_value, $max_value)
		{
			return ($value >= $min_value && $value <= $max_value) ? true : false;
		}

		/**
		 * Check if the given input is a valid date.
		 * 
		 * @param  mixed  $value
		 * @return boolean
		 */
		public function date($value)
		{
	        if ($value instanceof \DateTime) {
	            return true;
	        }

	        if (strtotime($value) === false) {
	            return false;
	        }

	        $date = date_parse($value);

	        return checkdate($date['month'], $date['day'], $date['year']);
		}

		/**
		 * Check if the given input has a match for the regular expression given
		 * 
		 * @param  mixed $value
		 * @param  string $regex
		 * @return boolean
		 */
		public function regex($value, $regex)
		{
			return (bool) preg_match($regex, $value);
		}

		/**
		 * If a field has been 'checked' or not, meaning it contains
		 * one of the following values: 'yes', 'on', '1', 1, true, or 'true'.
		 * This can be used for determining if an HTML checkbox has been checked.
		 * 
		 * @param  mixed $value
		 * @return boolean
		 */
		public function checked($value)
		{
			return in_array($value, ['yes', 'on', '1', 1, true, 'true'], true);
		}

		/**
		 * Check if the value is a valid IP address.
		 * 
		 * @param  mixed $value
		 * @return boolean
		 */
		public function ip($value)
		{
			return filter_var($value, FILTER_VALIDATE_IP) !== false;
		}

		/**
		 * Check if the value is a boolean.
		 * 
		 * @param  mixed $value
		 * @return boolean
		 */
		public function bool($value)
		{
			return is_bool($value);
		}

		/**
		 * Checks if one given input matches the other.
		 * For example, checking if password matches password_confirm.
		 * 
		 * @param  mixed $value
		 * @param  mixed $match_value
		 * @return boolean
		 */
		public function matches($value, $match_value)
		{
			return $value === $match_value;
		}
	}
}