<?php


//Title Validation
//Author : Harish Chauhan
//Date   : 24 Aug,2004
//This file contains the functions for input data validation
//at server side with the help of php script.


class Validation
{
//  this function checks the email format is correct or not
//  and return true or false accordingly.
	function is_email($email)
	{
		if(!preg_match("/^[A-Za-z0-9\._\-+]+@[A-Za-z0-9_\-+]+(\.[A-Za-z0-9_\-+]+)+$/",$email))
			return false;
		return true;
	}
// End of is_email Function

//  this function checks the given number is signed/unsigned number
//  and return true or false accordingly.
	function is_number($number)
	{
		if(!preg_match("/^\-?\+?[0-9e1-9]+$/",$number))
			return false;
		return true;
	}
// End of is_number Function

//  this function checks the given number is unsigned number
//  and return true or false accordingly.
	function is_unsign_number($number)
	{
		if(!preg_match("/^\+?[0-9]+$/",$number))
			return false;
		return true;
	}
// End of is_unsign_number Function
	
//  this function checks the given string is alphanumeric word or not
//  and return true or false accordingly.
	function is_alpha_numeric($str)
	{
		if(!preg_match("/^[A-Za-z0-9 ]+$/",$str))
			return false;
		return true;
	}
// End of is_alpha_numeric Function

//  this function checks the given date is valid or not.
//  and return true or false accordingly.
	function is_date($d)
	{
		if(!preg_match("/^(\d){1,2}[-\/](\d){1,2}[-\/]\d{4}$/",$d,$matches))
			return -1;//Bad Date Format
		$T = split("[-/\\]",$d);
		$MON=array(0,31,28,31,30,31,30,31,31,30,31,30,31);
		$M = $T[0];
		$D = $T[1];
		$Y = $T[2];
		return $D>0 && ($D<=$MON[$M] ||	$D==29 && $Y%4==0 && ($Y%100!=0 || $Y%400==0)); 
	}
	//End of is_data function
}

?>