Base10 to base64 url shortening

Question

I\'m coding an url shortener function for a project in which I\'m learning php, here is the code (btw I suppose that global here is not a good thing to do :P):<

Answer 1

By the way, check out the base_convert() function (http://php.net/manual/en/function.base-convert.php):

echo base_convert(1000000000, 10, 36);

36 is the longest base it can convert to, though. But in the comments section I found this:

function dec2any( $num, $base, $index=false ) {
    if (! $base ) {
        $base = strlen( $index );
    } else if (! $index ) {
        $index = substr( "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ" ,0 ,$base );
    }
    $out = "";
    for ( $t = floor( log10( $num ) / log10( $base ) ); $t >= 0; $t-- ) {
        $a = floor( $num / pow( $base, $t ) );
        $out = $out . substr( $index, $a, 1 );
        $num = $num - ( $a * pow( $base, $t ) );
    }
    return $out;
}

echo dec2any(1000000000, 64, "_-abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789");

Maybe it will help?