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<?php

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class wfHelperBin {

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/**

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* @param string $bin1

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* @param string $bin2

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* @return mixed

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public static function addbin2bin($bin1, $bin2) {

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if (strlen($bin1) % 4 != 0) {

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$bin1 = str_repeat("\0", 4 - (strlen($bin1) % 4)) . $bin1;

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}

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if (strlen($bin2) % 4 != 0) {

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$bin2 = str_repeat("\0", 4 - (strlen($bin2) % 4)) . $bin2;

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}

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$bin1_ints = array_reverse(array_values(unpack('N*', $bin1)));

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$bin2_ints = array_reverse(array_values(unpack('N*', $bin2)));

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$return = array();

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$carries = 0;

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for ($i=0; $i < max(count($bin1_ints), count($bin2_ints)); $i++) {

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$int1 = array_key_exists($i, $bin1_ints) ? $bin1_ints[$i] : 0;

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$int2 = array_key_exists($i, $bin2_ints) ? $bin2_ints[$i] : 0;

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$val = $int1 + $int2 + $carries;

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if ($carries > 0) {

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$carries = 0;

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}

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if ($val >= 0x100000000) {

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$val -= 0x100000000;

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$carries++;

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}

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$return[] = $val;

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}

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if ($carries) {

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$return[] += $carries;

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}

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$return = array_reverse($return);

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array_unshift($return, 'N*');

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$return = call_user_func_array('pack', $return);

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$return = ltrim($return, "\x00");

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return strlen($return) == 0 ? "\x00" : $return;

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}

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/**

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* Convert binary string to the 10101's representation.

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* @param string $string

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* @return string

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public static function bin2str($string) {

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$return = '';

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for ($i = 0; $i < strlen($string); $i++) {

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$return .= str_pad(decbin(ord($string[$i])), 8, '0', STR_PAD_LEFT);

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}

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$return = ltrim($return, '0');

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return strlen($return) == 0 ? '0' : $return;

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}

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/**

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* Convert 10101's representation back to the binary data.

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* @param string $string

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* @return string

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public static function str2bin($string) {

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if (strlen($string) % 32 > 0) {

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$string = str_repeat('0', 32 - (strlen($string) % 32)) . $string;

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}

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$ints = str_split($string, 32);

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$return = '';

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foreach ($ints as $int) {

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$return .= pack('N', bindec($int));

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}

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$return = ltrim($return, "\0");

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return strlen($return) == 0 ? "\0" : $return;

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}

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}

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