Mask IBAN with PHP for privacy (GDPR/DSGVO)

README.md

Mask IBAN with PHP for privacy (GDPR/DSGVO)

Masks an IBAN so that the user still recognizes you, but no one else can do anything with it.

<?php
/**
 * Masks an IBAN so that the user still recognizes you, but no one else can do anything with it.
 * @param  string $iban           the iban to mask
 * @param  string $mask_character character/symbol to replace
 * @return string                 masked iban
 */
function maskIBAN($iban, $mask_character = 'X') {
    return substr($iban,0,4) . str_repeat( $mask_character, strlen($iban) - 8 ) . substr($iban, -4);
}

mask_iban_dsgvo.php

<?php
/**
 * Masks an IBAN so that the user still recognizes you, but no one else can do anything with it.
 * @param  string $iban           the iban to mask
 * @param  string $mask_character character/symbol to replace
 * @return string                 masked iban
 */
function maskIBAN($iban, $mask_character = 'X') {
    return substr($iban,0,4) . str_repeat( $mask_character, strlen($iban) - 8 ) . substr($iban, -4);
}