CODEWITHSUNDEEP
phparrayssortingmultidimensional-arraycase-insensitive
Beginner
Beginner

Reputation: 1740

Sort single-element rows of a 2d array by case-sensitively comparing second level keys

Supposed I have an array of

$arr = [
    ['Peter' => 4],
    ['Piper' => 4],
    ['picked' => 4],
    ['peck' => 4],
    ['pickled' => 4],
];

How can I sort this multidimensional array by key example (Peter). I tried using

ksort($arr);

but it just return a boolean

The output that I want

[
    ['peck' => 4],
    ['Peter' => 4],
    ['picked' => 4],
    ['pickled' => 4],
    ['Piper' => 4],
]

the array should be sorted by key and in ascending order regardless of letter case.

Upvotes: 0

Views: 78

Answers (4)

mickmackusa
mickmackusa

Reputation: 47894

For less overheads while isolating and preparing data for comparison, pass the second level keys as the first parameter of array_multisort() then set the necessary flags to compare the keys case-insensitively. Demo

array_multisort(
    array_map(key(...), $array),
    SORT_ASC,
    SORT_STRING | SORT_FLAG_CASE,
    $array
);
var_export($array);

Upvotes: 0

Rahul
Rahul

Reputation: 18557

You can do something like this,

$temp = array_map(function($a){
    return key($a); // fetching all the keys
}, $arr);
natcasesort($temp); // sorting values case insensitive
$result = [];
// logic of sorting by other array
foreach($temp as $v){
    foreach($arr as $v1){
        if($v == key($v1)){
            $result[] = $v1;
            break;
        }        
    }
}

Demo

Output

Array
(
    [0] => Array
        (
            [peck] => 4
        )

    [1] => Array
        (
            [Peter] => 4
        )

    [2] => Array
        (
            [picked] => 4
        )

    [3] => Array
        (
            [pickled] => 4
        )

    [4] => Array
        (
            [Piper] => 4
        )

)

Upvotes: 0

LF-DevJourney
LF-DevJourney

Reputation: 28529

Sort with usort like this, check the demo

usort($array,function($a,$b){
    return strcmp(strtolower(key($a)),strtolower(key($b)));
});

Upvotes: 1

Jon Thoms
Jon Thoms

Reputation: 10739

The ksort() method does an in-place sort. So while it only returns a boolean (as you correctly state), it mutates the values inside $arr to be in the sorted order. Note that based on your expected output, it looks like you want to do a case insensitive search. For that, you need to use the SORT_FLAG_CASE sort flag. So, instead of calling ksort($arr), you instead want to use ksort($arr, SORT_FLAG_CASE). You can see how ksort() uses sort flags, in the sort() method's documentation. Hope that helps!

Upvotes: 0

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