while loop - Converting a decimal number to binary in PHP -


i have function converts numbers decimal binary.

<?php function decimaltobinary($num) {     $a = "";     $b = "";     $x = 0;     while ($num !=0)     {         $b .= $num % 2;         $num = $num /2;     }     /*     for($i = strlen($b) -1;$i >=0;$i--)     {         .= substr($b,$i,$i +1);     }*/     return $b;  } ?>

my problem return string:

010010100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

i wish return only:

0100101

how can achieve this?

$num = $num / 2; fractional division (implicitly converting float), causing $num approach 0 taking long time there. make $num = floor($num / 2); round down integer.

note there's decbin(), built-in method achieving this.

exemplary (but superfluous):

function decimaltobinary($num) {     return decbin($num); }

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