PHP Generate Random Number Between 00 - 29

Question

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Formatting a number with leading zeros in PHP

I have values between 00 - 29 that need to be selected randomly using PHP. I tried to use rand() function, but it gives me 0 - 29. not 00, 01, 02, 03 ... etc.

how to get 00 - 09 instead of 0 - 9 from PHP randomly? thanks.

score 13 · Accepted Answer · answered Aug 08 '12 at 13:44

13

$random = sprintf("%02f", rand(0,29));

or, as mentioned in the comments:

$random = str_pad(rand(0,29), 2, "0", STR_PAD_LEFT);

answered Aug 08 '12 at 13:44

John Conde

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I would make that sprintf instead of spintf ;) – snaderss Aug 08 '12 at 13:45
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+1 Beat me. `str_pad()` is a good option too. Little less technical than `*printf()` in this case. – Jason McCreary Aug 08 '12 at 13:45
it gives me : 0.00, 1.00, 2.00... not 00, 01, 02... is there something missing here? – Saint Robson Aug 08 '12 at 13:48
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Updated the answer to also show `str_pad()` (good point Jason) and fixed the decimal bug – John Conde Aug 08 '12 at 13:49
He had the wrong format for `sprintf()` see update. (told you it was technical :) – Jason McCreary Aug 08 '12 at 13:49
IT WORKS!! but, I have to wait for next 6 minutes to accept this as answer... LOL! – Saint Robson Aug 08 '12 at 13:52

Justin John · Answer 2 · 2012-08-08T13:52:30.073

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Create an array like

$array = array('00','01','02','03'....,'29');
echo $array[array_rand($array)];

edited Aug 08 '12 at 13:52

answered Aug 08 '12 at 13:45

Justin John

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+1 For providing an alternative. Although quite an *ugly* solution :) – Jason McCreary Aug 08 '12 at 13:48
@JasonMcCreary I agree. It is an ugly solution. – Leonel Machava Aug 08 '12 at 13:51
Yep, it will work, but just do not do like that:) – Gino Pane Apr 01 '16 at 10:18

score 1 · Answer 3 · answered Aug 08 '12 at 13:46

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Use str_pad:

$random = str_pad(rand(0, 29), 2, '0', STR_PAD_LEFT);

answered Aug 08 '12 at 13:46

Giacomo1968

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score 0 · Answer 4 · answered Aug 08 '12 at 13:44

0

a) Add a "0" if the value ist below 10

b) Use number_format to process the output

answered Aug 08 '12 at 13:44

rollstuhlfahrer

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score 0 · Answer 5 · answered Aug 08 '12 at 13:46

0

You can use sprintf to format the number.

$number = rand(0,29);
$number = sprintf("%02d", $number);

Search PHP manual for sprintf

answered Aug 08 '12 at 13:46

Fábio Alves

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score 0 · Answer 6 · answered Aug 08 '12 at 13:47

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You can also use this approach that doesn't depend on additional functions:

$n = rand(0, 29);
if( $n < 10 ) $n = "0" . $n;

answered Aug 08 '12 at 13:47

Leonel Machava

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Yes this work. But silly when native functions exist. Why code around them? [Be a better PHP developer](http://jason.pureconcepts.net/2012/08/better-php-developer/). – Jason McCreary Aug 08 '12 at 13:51

PHP Generate Random Number Between 00 - 29

6 Answers6