How to format an integer as two digits?

Question

function months(){
    for($i=1;$i<=12;$i++)
    if($i<10)   {
    echo '<option value="'."0".$i.'">'."0".$i.'</option>';
    }
    else{
    echo '<option value="'.$i.'">'.$i.'</option>';
    }
}

This populates a dropdown with 01, 02, 03... instead of 1, 2, 3...

So, I concatenated 0 and $i if $i<10 and it works, but maybe it is possible by formatting $i as two digits, or some similar, shorter method ?

PHP's built-in [`str_pad()`](http://us1.php.net/manual/en/function.str-pad.php), among other methods. — Michael Berkowski, Sep 01 '13 at 11:53

score 5 · Answer 1 · answered Sep 01 '13 at 11:56

5

You don't want the value itself to be two digits, only the display.

echo '<option value="' . $i . '">' . sprintf('%02d', $i) . '</option>';

answered Sep 01 '13 at 11:56

Ignacio Vazquez-Abrams

776,304
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1,341
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value is not formated as required – MD SHAHIDUL ISLAM Sep 01 '13 at 12:00
@Salim: Value should **never** be formatted. – Ignacio Vazquez-Abrams Sep 01 '13 at 12:01
you are right but his requirements is like – MD SHAHIDUL ISLAM Sep 01 '13 at 12:04
And? I'm saving him from pain he'll experience later. "Why doesn't 08 work? *cry*" – Ignacio Vazquez-Abrams Sep 01 '13 at 12:05

DevZer0 · Answer 2 · 2013-09-01T12:21:05.510

3

you can use str_pad

$str = str_pad($i, 2, "0", STR_PAD_LEFT);

edited Sep 01 '13 at 12:21

answered Sep 01 '13 at 11:56

DevZer0

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Second argument must be 2 as required – MD SHAHIDUL ISLAM Sep 01 '13 at 12:08

score 2 · Answer 3 · answered Sep 01 '13 at 11:57

2

function months() {
  for ($i = 1; $i <= 12; $i ++) {
    $number = sprintf("%02d", $i);
    echo '<option value="' . $number . '">' . $number . '</option>';
  }
}

answered Sep 01 '13 at 11:57

aaaaaa123456789

5,541
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score 2 · Answer 4 · answered Sep 01 '13 at 11:58

2

Use str_pad like this -

   function months(){
        for($i=1;$i<=12;$i++) {
         echo '<option    value="'.str_pad($i,2,"0",STR_PAD_LEFT).'">"'.str_pad($i,2,"0",STR_PAD_LEFT).'</option>';    
        }    

    }

answered Sep 01 '13 at 11:58

MD SHAHIDUL ISLAM

14,325
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82
89

score 2 · Accepted Answer · answered Sep 01 '13 at 11:59

2

By adding another variable you could shorten it to:

function months(){
    for($i=1;$i<=12;$i++)
         $mo = ($i<10) ? "0".$i : $i;
         echo '<option value="'.$i.'">'.$mo.'</option>';
    }
}

answered Sep 01 '13 at 11:59

How to format an integer as two digits?

5 Answers5