PHP Regex to validate Emirates ID number

eid_regex.php

<?php

/**
 * Regex example to validate the format of a Emirates
 * ID number. Does not validate the checkbit (Luhn Algorithm).
 *
 * @author     Niraj Shah <niraj@webniraj.com>
 */

// regex to validate the format xxx-xxxx-xxxxxxx-x (Emirates ID)
$regex = '/^784-[0-9]{4}-[0-9]{7}-[0-9]{1}$/';

// Emirates IDs to check
$eids = [
    "784-1980-1234567-9",
    "123-1234-0123456-7",
    "784198012345679"
  ];
  
// empty array to store matches
$matches = [];

foreach ( $eids as $id ) {
  preg_match( $regex, $id, $matches );

  // if match, show VALID
  if ( count( $matches ) == 1 ) {
    echo "{$id}: VALID</br>";
  } else {
    echo "{$id}: INVALID</br>";
  }
}

Excuse me, how do you know it uses Luhn Algorithm? I cannot found formal reference mentioned about that.

@niraj-shah: Helpful. many thanks.

Excuse me, how do you know it uses Luhn Algorithm? I cannot found formal reference mentioned about that.
can someone help with this?

Excuse me, how do you know it uses Luhn Algorithm? I cannot found formal reference mentioned about that.

While there is no official documentation, the algorithm has been tested against real EID cards.

It hasn't been tested against thousands of valid EID cards as it's difficult to obtain a database to test against. You can check it against your own and see if it works.