How to display Currency in Indian Numbering Format in PHP

Question

I have a question about formatting the Rupee currency (Indian Rupee - INR).

For example, numbers here are represented as:

1
10
100
1,000
10,000
1,00,00         


        

Answer 1

So if I'm reading that right, the Indian Numbering System separates the thousands, then every power of a hundred past that? Hmm...

Perhaps something like this?

function indian_number_format($num) {
    $num = "".$num;
    if( strlen($num) < 4) return $num;
    $tail = substr($num,-3);
    $head = substr($num,0,-3);
    $head = preg_replace("/\B(?=(?:\d{2})+(?!\d))/",",",$head);
    return $head.",".$tail;
}