Showing mele or female and brith date from entered personal id number

[HaxorNab]

Hi, I have a problem. I am doing one little job with php and html.
In html i have textbox in which person id must be entered (11 numbers) 
I need to do with php that when all 11 numbers are entered, date of birth and gender need to be shown,
For example:
if id is : 39310121111

first number stands for mele/female (if 3 mele if 4 female) all next numbers are date of birth 1993 10 12 (last 4 numbers doesnt have meaning)

Basicly question is. how to make syntax that entered id will be shown as gender and date of birth ? can't think of any ideas. new at php.

Edited December 10, 2016 by HaxorNab

[requinix]

Take a look at substr. Write some code and if you have problems then come back and post what you have and a description about what is happening.

[Jacques1]

You should actually combine the data extraction with validation. Always expect to get wrong input.

 

Regular expressions can help you:

'/\\A(?<gender>3|4)(?<dob>\\d{6})\\d{4}\\z/'

Read: A 3 or 4 followed by 6 digits for the date of birth followed by another 4 digits.

 

You can then easily extract the ID parts:

<?php

const ID_PATTERN = '/\\A(?<gender>3|4)(?<dob>\\d{6})\\d{4}\\z/';



$input = '39310121111';

// validate the input and simultaneously extract the parts
$idParts = null;
if (!preg_match(ID_PATTERN, $input, $idParts))
{
    die('Invalid input. Please enter a valid 11-digit ID.');
}

// the individual parts
var_dump($idParts['gender'], $idParts['dob']);

Storing the year of birth as two digits isn't very smart, because now you need extra logic to distinguish between 19xx and 20xx. Let's not repeat the 2K problem.

[HaxorNab]

Thanks for reply guys, gonna try it right away