replacing all x numbers except last 4 within input value

Question

I have an input that looks like this

<input value="{{gameAccount.getAccountNumber() }}" disabled name="accountNumber" type="text">

which displays:

123456789

but I want it to display

*****6789

I get confused when it is in input value in this particular case with gameAccount.getAccountNumber()

substr($something?, 0, -4) . '****';

How do I go about this? thanks in advance

I also saw substr_replace() function...

Answer 1

As @ficuscr points out this is a better one liner for this:

$gameId = '123456789';
$gameId = str_repeat('*', strlen($gameId) - 4) . substr($gameId, -4);

There may be a more elegant way to do this but this will work:

$gameId = '123456789';

$gameIdLenToMask = strlen($gameId) - 4;
$mask = str_pad('', $gameIdLenToMask, '*');

$gameIdMasked = substr_replace($gameId, $mask, 0, $gameIdLenToMask);

// Prints: "*****6789" 
var_dump($gameIdMasked);

For more information see the docs for str_replace and str_pad on php.net.