Add "0" to the front of an integer

Question

hi I'm generating an random integers using mt_rand(1, 99999) and if its not equal to 5 digits it will add 0 on the front of the integers.

here's my first try:

$random_number = mt_rand(1, 99999);
$ran_len = strlen($random_number);

while ($ran_len != 5 ) {
$add_ran_num = str_pad($random_number, 1, "0", STR_PAD_LEFT);
}

echo $add_ran_num;

Put `$ran_len = ...` in the loop or pad by the difference of 5. — Dave Chen, Aug 29 '13 at 09:09

score 7 · Answer 1 · edited Aug 29 '13 at 09:14

7

printf('%05d', mt_rand(1, 99999));

edited Aug 29 '13 at 09:14

hakre

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answered Aug 29 '13 at 09:11

Dejan Marjanović

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score 4 · Accepted Answer · answered Aug 29 '13 at 09:09

4

You don't need strlen nor while loop for that :

$random_number = mt_rand(1, 99999);
$add_ran_num = str_pad($random_number, 5, "0", STR_PAD_LEFT);
echo $add_ran_num;

answered Aug 29 '13 at 09:09

Glavić

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score 1 · Answer 3 · answered Aug 29 '13 at 09:11

1

This will do what you want

$random_number = str_pad(mt_rand(1, 99999), 5, "0", STR_PAD_LEFT);

answered Aug 29 '13 at 09:11

Anigel

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score 0 · Answer 4 · answered Aug 29 '13 at 09:11

You don't update the value of $ran_len:

$random_number = mt_rand(1, 99999);
$ran_len = strlen($random_number);

while ($ran_len != 5 ) {    
    $add_ran_num = str_pad($random_number, 1, "0", STR_PAD_LEFT);
    $ran_len = strlen($random_number);//<---
}

echo $add_ran_num;

Thus the loop is infinite.

Add "0" to the front of an integer

4 Answers4