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-2.2.1.98	tracks/php/exercises/binary/example.php
trackler-2.2.1.97	tracks/php/exercises/binary/example.php
trackler-2.2.1.96	tracks/php/exercises/binary/example.php
trackler-2.2.1.95	tracks/php/exercises/binary/example.php
trackler-2.2.1.94	tracks/php/exercises/binary/example.php
trackler-2.2.1.93	tracks/php/exercises/binary/example.php
trackler-2.2.1.92	tracks/php/exercises/binary/example.php
trackler-2.2.1.91	tracks/php/exercises/binary/example.php
trackler-2.2.1.90	tracks/php/exercises/binary/example.php
trackler-2.2.1.89	tracks/php/exercises/binary/example.php
trackler-2.2.1.88	tracks/php/exercises/binary/example.php
trackler-2.2.1.87	tracks/php/exercises/binary/example.php
trackler-2.2.1.86	tracks/php/exercises/binary/example.php
trackler-2.2.1.85	tracks/php/exercises/binary/example.php
trackler-2.2.1.84	tracks/php/exercises/binary/example.php
trackler-2.2.1.83	tracks/php/exercises/binary/example.php
trackler-2.2.1.82	tracks/php/exercises/binary/example.php
trackler-2.2.1.81	tracks/php/exercises/binary/example.php
trackler-2.2.1.80	tracks/php/exercises/binary/example.php
trackler-2.2.1.79	tracks/php/exercises/binary/example.php