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

You can use the pack.

$int = 1129717211140920362;

$byte = pack('J*', $int);    
echo base64_encode($byte); //= D62P0WqzFCo=

It will result in D62P0WqzFCo=, it is correct, because the $int is an int64 and uses 64 bits. The Base64 uses 6 bits for each character, so they need ~11 characters.

To decode use:

$base64 = 'D62P0WqzFCo=';

$byte = base64_decode($base64);
echo unpack('J*',  $byte)[1]; //= 1129717211140920362

It will return 1129717211140920362. ;)

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_{It was based in the answer on the Stackoverflow in Portuguese.}