Php array replace 0 wth 00

Question

I have an array which looks like this:

$a = [
  0 => "0",
  1 => "01",
  2 => "00",
]

I want to replace single zeros with two zeros.

should look like this:

[
  0 => "00",
  1 => "01",
  2 => "00",
]

I did this:

$newDigit = str_replace("0", "00", $splitDigit);

But it added everywhere 2 zeros:

[
  0 => "000",
  1 => "0001",
  2 => "0000",
]

How do I solve this?

Use a formatting function like [sprintf()](http://www.php.net/manual/en/function.sprintf.php) — Mark Baker, Jun 30 '16 at 10:55

Mahdyfo · Answer 1 · 2016-06-30T13:00:02.767

2

foreach($arr as $str)
    $str = preg_replace('/^(0)$/', '00', $str);

or

foreach($arr as $str)
    if($str === '0')
            $str = '00';

or

sprintf() that is told.

edited Jun 30 '16 at 13:00

answered Jun 30 '16 at 10:59

Mahdyfo

1,155
7
18

missing $ at str = '00'; – utdev Jun 30 '16 at 11:07
I just could not add something like this if($value === '\X') { $value = '"'; } do I have to loop it through another loop – utdev Jun 30 '16 at 11:34
`preg_replace()` will happily iterate an array. The parentheses add no benefit in your pattern. – mickmackusa Sep 22 '21 at 03:26

Ben · Answer 2 · 2016-06-30T11:01:25.037

0

sprintf() is your friend:

$array = ["0", "01", "02"];

function doubleO($v){
    return(sprintf("%02d",$v));
}

$array = array_map("doubleO",$array);
print_r($array);

Outputs:

Array ( [0] => 00 [1] => 01 [2] => 02 )

edited Jun 30 '16 at 11:01

answered Jun 30 '16 at 10:57

Ben

8,894
7
44
80

I'm not the op, but if I copy paste your code, I get `Array ( [0] => d [1] => d [2] => d )` – FirstOne Jun 30 '16 at 11:01
@FirstOne Then you've copied it incorrectly mate... Just tested it twice because you made me paranoid and it's definitely working. [Screenshot Link](http://i.imgur.com/YvfUx1s.png) – Ben Jun 30 '16 at 11:02

Poiz · Answer 3 · 2016-06-30T11:21:26.927

Why not use do the replacement within a loop instead? Here:

<?php
        $arrDigits = [
                               0 => "0"
                               1 => "01"
                               2 => "00"
                              ];

        foreach($arrDigits as $key=>$strDigit){
            If ($strDigit == "0"){
                 $arrDigit[$key] = str_replace("0", "00", $strDigit);
            }
        }
        var_dump($arrDigits);

score 0 · Answer 4 · answered Jun 30 '16 at 11:09

Why not do the replacement within a simple loop, instead?

<?php
        $arrDigits = [
                               0 => "0"
                               1 => "01"
                               2 => "00"
                              ];

        foreach($arrDigits as $key=>$strDigit){
            If ($strDigit == "0"){
                 $arrDigit[$key] = str_replace("0", "00", $strDigit);
            }
        }
        var_dump($arrDigits);

Php array replace 0 wth 00

4 Answers4