How to see binary representation of variable

Question

Is there any possibility to see binary representation of variable?

Answer 1

decbin(your_int) will return a string in binary numbers representing the same value as your_int, assuming that's what you're asking for.

Answer 2

$a = 42;
for($i = 8 * PHP_INT_SIZE - 1; $i >= 0; $i --) {
    echo ($a >> $i) & 1 ? '1' : '0';
}

Answer 3

<?php
/**
 *    Returns an ASCII string containing
 *    the binary representation of the input data .
**/
function str2bin($str, $mode=0) {
    $out = false;
    for($a=0; $a < strlen($str); $a++) {
        $dec = ord(substr($str,$a,1));
        $bin = '';
        for($i=7; $i>=0; $i--) {
            if ( $dec >= pow(2, $i) ) {
                $bin .= "1";
                $dec -= pow(2, $i);
            } else {
                $bin .= "0";
            }
        }
        /* Default-mode */
        if ( $mode == 0 ) $out .= $bin;
        /* Human-mode (easy to read) */
        if ( $mode == 1 ) $out .= $bin . " ";
        /* Array-mode (easy to use) */
        if ( $mode == 2 ) $out[$a] = $bin;
    }
    return $out;
}
?>

Copied from: http://php.net/manual/en/ref.strings.php

Answer 4

Or you may use base_convert function to convert symbol codes to binary, here's a modified function:

function str2bin($str) 
{
    $out=false; 
    for($a=0; $a < strlen($str); $a++)
    {
        $dec = ord(substr($str,$a,1)); //determine symbol ASCII-code
        $bin = sprintf('%08d', base_convert($dec, 10, 2)); //convert to binary representation and add leading zeros
        $out .= $bin;
    }
    return $out;
}

It is useful to convert inet_pton() result to compare ipv6 addresses in binary format (since you cannot really convert a 128-bit ipv6 address to integer, which is 32- or 64-bit in php). You can find more on ipv6 and php here (working-with-ipv6-addresses-in-php) and here (how-to-convert-ipv6-from-binary-for-storage-in-mysql).

Answer 5

Like so:

echo decbin(3); // 11

Answer 6

What about: <?php $binary = (binary) $string; $binary = b"binary string"; ?>

(from php.net)