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-2.2.1.139	tracks/php/exercises/binary/example.php
trackler-2.2.1.138	tracks/php/exercises/binary/example.php
trackler-2.2.1.137	tracks/php/exercises/binary/example.php
trackler-2.2.1.136	tracks/php/exercises/binary/example.php
trackler-2.2.1.135	tracks/php/exercises/binary/example.php
trackler-2.2.1.134	tracks/php/exercises/binary/example.php
trackler-2.2.1.133	tracks/php/exercises/binary/example.php
trackler-2.2.1.132	tracks/php/exercises/binary/example.php
trackler-2.2.1.131	tracks/php/exercises/binary/example.php
trackler-2.2.1.130	tracks/php/exercises/binary/example.php
trackler-2.2.1.129	tracks/php/exercises/binary/example.php
trackler-2.2.1.128	tracks/php/exercises/binary/example.php
trackler-2.2.1.127	tracks/php/exercises/binary/example.php
trackler-2.2.1.126	tracks/php/exercises/binary/example.php
trackler-2.2.1.125	tracks/php/exercises/binary/example.php
trackler-2.2.1.124	tracks/php/exercises/binary/example.php
trackler-2.2.1.123	tracks/php/exercises/binary/example.php
trackler-2.2.1.122	tracks/php/exercises/binary/example.php
trackler-2.2.1.121	tracks/php/exercises/binary/example.php
trackler-2.2.1.120	tracks/php/exercises/binary/example.php