php验证类(Email、数字、字符串等的验证)

php 验证类的代码，如下：

0 && ($D<=$MON[$M] ||    $D==29 && $Y%4==0 && ($Y%100!=0 || $Y%400==0));  
    } 
    //End of is_data function 
}
?>

2，php 验证类的调用示例：

is_email($_POST['email'])) 
    echo "Email is Valid!"; 
else 
    echo "Not a valid email"; 
echo "
"; 

if($val->is_number($_POST['number'])) 
    echo "number is Valid!"; 
else 
    echo "Not a valid number"; 
echo "
"; 

if($val->is_alpha_numeric($_POST['String'])) 
    echo "String is Valid!"; 
else 
    echo "Not a valid String"; 
echo "
"; 
if($val->is_date($_POST['date'])>0) 
    echo "date is Valid!"; 
else 
    echo "Not a valid date"; 
echo "
"; 

?>