Comma-separated string to associative array with lowercase keys

Question

I have a string like this:

$string = 'Apple, Orange, Lemone';

I want to make this string to:

$array = array('apple'=>'Apple', 'orang'=>'Orange', 'lemone'=>'Lemone');

How to achieve this?

I used the explode function like this:

$string = explode(',', $string );

But that only gives me this:

Array ( [0] => Apple [1] => Orange [2] => Lemone )

Somebody says this question is a duplicate of this SO question: Split a comma-delimited string into an array?

But that question is not addressing my problem. I have already reached the answer of that question, please read my question. I need to change that result array's key value and case. see:

Array
(
    [0] => 9
    [1] => admin@example.com
    [2] => 8
)

to like this

Array
(
    [9] => 9
    [admin@example.com] => admin@example.com
    [8] => 8
)

Sanchit Gupta · Accepted Answer · 2016-12-29T11:34:19.170

3

You may try :

$string = 'Apple, Orange, Lemone';
$string = str_replace(' ', '', $string);

$explode = explode(',',$string);

$res = array_combine($explode,$explode);

echo '<pre>';
print_r($res);
echo '</pre>';

Or if you need to make lower case key for resulting array use following :

echo '<pre>';
print_r(array_change_key_case($res,CASE_LOWER));
echo '</pre>';

edited Dec 29 '16 at 11:34

answered Dec 29 '16 at 11:12

Sanchit Gupta

3,148
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2

You don't need to call explode twice – Dec 29 '16 at 11:15
1

this solution gives you array keys in with the same case as the values. The question specifies lowercase array keys. – John Corry Dec 29 '16 at 11:24

Mittul At TechnoBrave · Answer 2 · 2016-12-29T11:29:13.373

3

<?php 
$string = 'Apple, Orange, Lemone'; // your string having space after each value
$string =str_replace(' ', '', $string); // removing blank spaces
$array = explode(',', $string );
$final_array = array_combine($array, $array);
$final_array = array_change_key_case($final_array, CASE_LOWER); // Converting all the keys to lower case based on your requiment 
echo '<pre>';
print_r($final_array);

?>

edited Dec 29 '16 at 11:29

answered Dec 29 '16 at 11:22

Mittul At TechnoBrave

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score 3 · Answer 3 · answered Dec 29 '16 at 11:41

3

You can use array functions such as array_combine, and array_values

$string = 'Apple, Orange, Lemone';

$arr = explode(', ', $string);

$assocArr = array_change_key_case(
  array_combine(array_values($arr), $arr)
);

answered Dec 29 '16 at 11:41

Hamed Ghaderi

100
1
10

1

that's good. I think the keys really should be run through `trim()` to remove any whitespace. – John Corry Dec 29 '16 at 12:34
seems this the better way of achieving the result, thanx. – Salih K Dec 29 '16 at 17:36
`array_values()` is a useless call here. – mickmackusa Mar 10 '21 at 03:54

score 2 · Answer 4 · answered Dec 29 '16 at 11:12

<?php
$string = 'Apple, Orange, Lemone';
$array = explode(', ', $string);
print_r($array);

output will be

Array
(
    [0] => Apple
    [1] => Orange
    [2] => Lemone
)

Now

$ar = array();
    foreach ($array as $value) {
        $ar[$value] = $value;
    }

print_r($ar);

Your Desire Output:

Array
(
    [Apple] => Apple
    [Orange] => Orange
    [Lemone] => Lemone
)

score 1 · Answer 5 · answered Dec 29 '16 at 11:12

1

$valuesInArrayWithSpace = explode("," $string);

$finalArray = [];

foreach ($ValuesInArrayWitchSpace as $singleItem) {

    $finalArray[trim(strtolower($singleItem))] = trim($singleItem);
}

answered Dec 29 '16 at 11:12

omxv

616
6
11

Why `trim()` the same value twice per iteration? Why not just split on comma-space? – mickmackusa Mar 10 '21 at 03:58

John Corry · Answer 6 · 2016-12-29T11:32:49.983

1

Or...

$csvdata = str_getcsv('Apple,Orange,Lemone');
$arr = [];

foreach($csvdata as $a) {
    $arr[strtolower(trim($a))] = $a;
}

print_r($arr);

edited Dec 29 '16 at 11:32

answered Dec 29 '16 at 11:18

John Corry

1,567
12
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score 1 · Answer 7 · answered Dec 29 '16 at 11:19

1

This way you'll have what you need:

$lowerString = strtolower($string);
$values = explode(', ', $string);
$keys   = explode(', ', $lowerString);
$array  = array_combine($keys, $values);
print_r($array);

answered Dec 29 '16 at 11:19

Vinicius Dias

664
3
15

1

This approach discards the string case data instead of retaining it in the values. – John Corry Dec 29 '16 at 11:33

JYoThI · Answer 8 · 2016-12-29T11:22:00.423

0

use array_flip to change the values as key and use array_combine

<?php
     $string = 'Apple, Orange, Lemone';
     $array = explode(', ', $string);

     $new_array =array_flip($array);
     $final_array = array_combine($new_array,$array)
     print_r($final_array );

?>

edited Dec 29 '16 at 11:22

answered Dec 29 '16 at 11:15

JYoThI

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1
11
26

this will give you Array ( [Apple] => 0 [Orange] => 1 [Lemone] => 2 ) – Salih K Dec 29 '16 at 11:19
Not only is this snippet missing a semicolon, it does not provide the desired output. https://3v4l.org/AZ9V4 If this was the desired output, you would only call `explode()` and be done with it. This answer can be safely removed. – mickmackusa Mar 10 '21 at 03:57

score 0 · Answer 9 · answered Aug 09 '22 at 22:00

A clean, functional-style approach can use array_reduce() after splitting on commas followed by spaces.

Before pushing the new associative values into the result array, change the key to lowercase.

Code: (Demo)

$string = 'Apple, Orange, Lemone';
var_export(
    array_reduce(
        explode(', ', $string),
        fn($result, $v) =>
            $result + [strtolower($v) => $v],
        []
    )
);

Output:

array (
  'apple' => 'Apple',
  'orange' => 'Orange',
  'lemone' => 'Lemone',
)

Comma-separated string to associative array with lowercase keys

9 Answers9