Question

How to print binary representation (bits) of a number in PHP

Answer 1

echo decbin(9) . "<br />";
echo decbin(13) . "<br />";
echo decbin(15) . "<br />";
echo decbin(20) . "<br />";

 
/*
run:

1001
1101
1111
10100

*/

 

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Answer 2

echo dec2bin(9) . "<br />";
echo dec2bin(13) . "<br />";
echo dec2bin(15) . "<br />";
echo dec2bin(20) . "<br />";

function dec2bin($dec, $pad = 8) 
{
    return str_pad(decbin($dec), $pad, "0", STR_PAD_LEFT);
}
 
/*
run:

00001001
00001101
00001111
00010100

*/

 

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