validate

validate

if(empty($data_to_db['user_name'])) {
			$_SESSION['errors']['user_name'] = "User name is required";   
		}
	   if(empty($data_to_db['user_email'])) {
		 $_SESSION['errors']['user_email'] = "Email is required";    
		}
		if( filter_var( $data_to_db['user_email'] , FILTER_VALIDATE_EMAIL) ) {
			$_SESSION['errors']['user_email'] = "Email is required";    
		   }
		if (empty($data_to_db['password'])) {
			$_SESSION['errors']['password'] = "Password is required";    
		}
		if(strlen( $data_to_db['password'] ) < 8)
        {
			$_SESSION['errors']['password2'] = "Password must be more than 8 characters in length";  
        }
		if( !(preg_match('#[0-9]#', $data_to_db['password'] ) ))
        {
			$_SESSION['errors']['password3'] = "Password must contain at least one number";  
        }
		if (!preg_match('/([a-z]{1,})/', $data_to_db['password'] )) {
			// atleast one lowercase letter
			$_SESSION['errors']['password4'] = "Password must contain at atleast one lowercase letter"; 
		}		
		if (!preg_match('/([A-Z]{1,})/', $data_to_db['password'] )) {
			// atleast one uppercase letter
			$_SESSION['errors']['password5'] = "Password must contain at least one uppercase letter"; 
		}
		if (!preg_match("/\W/", $data_to_db['password'] )) {
			$_SESSION['errors']['password6'] = "Password should contain at least one special character";
		}