Contents

<?php

/**
 * Converts binary value to a decimal.
 *
 * @param string $binary
 *
 * @return int
 */
function parse_binary($binary)
{
    $reversed = strrev($binary);

    for ($i = 0, $decimal = 0; $i < strlen($reversed); ++$i) {
        if ($reversed[$i] !== '0' && $reversed[$i] !== '1') {
            throw new InvalidArgumentException('Invalid binary string.');
        }

        $decimal += ((int) $reversed[$i]) * (2 ** $i);
    }

    return $decimal;
}

Version data entries

396 entries across 396 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/php/exercises/binary/example.php
trackler-2.2.1.179	tracks/php/exercises/binary/example.php
trackler-2.2.1.178	tracks/php/exercises/binary/example.php
trackler-2.2.1.177	tracks/php/exercises/binary/example.php
trackler-2.2.1.176	tracks/php/exercises/binary/example.php
trackler-2.2.1.175	tracks/php/exercises/binary/example.php
trackler-2.2.1.174	tracks/php/exercises/binary/example.php
trackler-2.2.1.173	tracks/php/exercises/binary/example.php
trackler-2.2.1.172	tracks/php/exercises/binary/example.php
trackler-2.2.1.171	tracks/php/exercises/binary/example.php
trackler-2.2.1.170	tracks/php/exercises/binary/example.php
trackler-2.2.1.169	tracks/php/exercises/binary/example.php
trackler-2.2.1.167	tracks/php/exercises/binary/example.php
trackler-2.2.1.166	tracks/php/exercises/binary/example.php
trackler-2.2.1.165	tracks/php/exercises/binary/example.php
trackler-2.2.1.164	tracks/php/exercises/binary/example.php
trackler-2.2.1.163	tracks/php/exercises/binary/example.php
trackler-2.2.1.162	tracks/php/exercises/binary/example.php
trackler-2.2.1.161	tracks/php/exercises/binary/example.php
trackler-2.2.1.160	tracks/php/exercises/binary/example.php