Quickly add + to positive strings [PHP]

Question

Hay all, is there a PHP function which adds "+" to positive strings?

i.e

function(4) // returns +4
function(1.0) // returns +1.0
function(-1) // returns -1
function(0) // returns +0

Thanks

EDIT: wants to take and return strings.

Answer 1

Home made function

function make_positive($int){
    if($int >= 0){
        return "+".$int;
    }else{
        return $int;
    }
}

Does PHP have its own?

EDIT: changed function name.

Answer 2

You could use (s)printf with the following:

$number = sprintf('%+f', $number);
// "-0"  => +0.000000
// "1.2" => +1.200000

or

function formatPositive($number)
{
    return ($number > 0) ? "+$number" : $number;
    // "0"   => "0"
    // "-0"  => "-0"
    // "1.2" => "+1.2"
}

or

function formatPositive($number)
{
    switch(true) {
        case !is_numeric($number): // "Beer" => "NaN"
            $number = 'NaN'; 
            break;
        case $number == 0: // "-0" = "±0"
            $number "±0";
            break;
        case $number > 0: // "1.23" => "+1.23" 
            $number = "+$number";
            break;
        default:  // "-1.23" => "-1.23" 
            break;
    }
    return "$number";
}

Answer 3

sprintf("%+d", 5);    # should give +5
sprintf("%+d", -5);   # should give -5

Quick reference: http://www.php.net/sprintf

Answer 4

$i = 3;
printf('%+d ', $i);

$i = -3;
printf('%+d ', $i);

prints +3 -3 (and also works with sprintf() if needed)

Answer 5

The PHP language reference for sprintf suggests "%+d" as a format specifier for positive signed integers.