How to see binary representation of variable

Question

Is there any possibility to see binary representation of variable?

Answer 1

Like so:

echo decbin(3); // 11

Answer 2

Another solution:

function d2b($dec, $n = 16) {
    return str_pad(decbin($dec), $n, "0", STR_PAD_LEFT);
}

Example:

// example:
echo d2b(E_ALL);
echo d2b(E_ALL | E_STRICT);
echo d2b(0xAA55);
echo d2b(5);

Output:
0111011111111111
0111111111111111
1010101001010101
0000000000000101