Adding a string and an integer in php

Question

I'm trying to add a 1 in front of my binary code and this is how I'm going about it: if I have 0101, for example, then I'd add a number with 4 zeroes, like 10000 so it would become 10101. Here's my code:

$fill = strlen($string);
$number = '1';
$add = str_pad($number, $fill, '0', STR_PAD_RIGHT);
$m1 = $string + $add;

The problem is the output for that is something like 1.random number e+Random number

Explosion Pills · Accepted Answer · 2012-12-15 21:09:09Z

1

assuming $string is your "0101" string, you could just do $m1 = '1'.$string;

edited Dec 15, 2012 at 21:09

Explosion Pills

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answered Dec 15, 2012 at 21:05

Niet the Dark Absol

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1 Comment

user1906878 Over a year ago

I haden't figured on that since I was assuming I had to use math.

Explosion Pills · Accepted Answer · 2012-12-15 21:08:39Z

0

My previous answer was wrong because the length of the string is potentially variable and str_pad requires you to know the length. This will work, but it doesn't look so elegant:

if (strpos($string, '0') === 0) {
   $string = '1' . $string;
}

answered Dec 15, 2012 at 21:08

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