How to convert binary to decimal without using PHP native functions?

Question

My code is like this :

<?php

function binary_to_decimal($a) {
    $bin_array = str_split($a);

    $y=sizeof($bin_array)-1;
    for ($x=0; $x<sizeof($bin_array)-1; $x++) {
        if ($bin_array[$x] == 1) {
            $bin_array[$x] = bcpow(2, $y);
        }
        $y--;
    }

    for ($z=0; $z<sizeof($bin_array); $z++) {
        $result = bcadd($result, $bin_array[$z]);
    }
    echo $result;
}

binary_to_decimal('11111');

?>

It still using PHP native functions. For example : bcpow, sizeof, bcadd.

Whether it can convert binary to decimal without using PHP native functions?

Thank you

php.net/manual/en/function.bindec.php in php exist function for this if I don't wrong bindec — Naumov
– Naumov, Commented Apr 20, 2016 at 10:59

Niklesh Raut · Accepted Answer · 2016-04-20 11:10:40Z

1

Here is in http://php.net/manual/en/function.bindec.php#44910

function reconvert($bin_nr) {
 $base=1;
 $dec_nr=0;
 $bin_nr=explode(",", preg_replace("/(.*),/", "$1", str_replace("1", "1,", str_replace("0", "0,", $bin_nr))));
 for($i=1; $i<count($bin_nr); $i++) $base=$base*2;
 foreach($bin_nr as $key=>$bin_nr_bit) {
     if($bin_nr_bit==1) {
         $dec_nr+=$base;
         $base=$base/2;
     }
     if($bin_nr_bit==0) $base=$base/2;
 }
 return(array("string"=>chr($dec_nr), "int"=>$dec_nr));
}

Check here : https://eval.in/556903

answered Apr 20, 2016 at 11:10

Niklesh Raut

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