How to make array key lowercase?

[jacorre]

I’m trying to change array keys to lowercase. I tried using array_change_key_case but it’s not working and I think it’s because I’m using arrays within arrays. Here is an example:

array (

[0] = array

(

[Amount] => 1

[Measurement] => Cup

[Ingredient] => Sugar

[Notes] => Some comments

)

[1] = array

(

[Amount] => 2

[Measurement] => Cups

[Ingredient] => Flour

[Notes] => Some comments

)

)

I’m trying to get it so that the keys switch to lowercase like:

array (

[0] = array

(

[amount] => 1

[measurement] => Cup

[ingredient] => Sugar

[notes] => Some comments

)

[1] = array

(

[amount] => 2

[measurement] => Cups

[ingredient] => Flour

[notes] => Some comments

)

)

Doesn’t seem to work with array_change_key_case?

[jacorre]

I did see that function but didn’t seem to work for me. I may have been using it wrong. I’ll try again and see. Thanks!

[jamygolden]

$a = array(

array(

'Amount' => 1,

'Measurement' => 'Cup',

'Ingredient' => 'Sugar',

'Notes' => 'Some comments'

),

array(

'Amount' => 2,

'Measurement' => 'Cups',

'Ingredient' => 'Flour',

'Notes' => 'Some comments'

)

);



function strToLowerArray ( $vals ) {



return strtolower( $vals );



}



foreach( $a as $arr  ) {



$b[] = array_map("strToLowerArray", $arr);

}



print_r($b);

?>

Edit: Oh you said the KEY should be lowercase…

$a = array(

array(

'Amount' => 1,

'Measurement' => 'Cup',

'Ingredient' => 'Sugar',

'Notes' => 'Some comments'

),

array(

'Amount' => 2,

'Measurement' => 'Cups',

'Ingredient' => 'Flour',

'Notes' => 'Some comments'

)

);



foreach( $a as $arr  ) {



print_r(array_change_key_case($arr, CASE_LOWER));

echo '
';

}



?>

[jacorre]

Thanks jamy_za I like that method better. Less code! And testing it online seems to work nicely. Thanks again!

[nphp101]

function arrIndexLowerCase($arr = null){
$arr = array_change_key_case($arr,CASE_LOWER);
$newArr = $arr;
foreach ($arr as $k => $v){
if (is_array($v)){
$newArr[$k] = $this->arrIndexLowerCase($v);
}
}
return $newArr;
}

[nphp101]

recursive function will do the magic tricks for multi-arrays, as stated above.

[CrocoDillon]

Old post but you don’t even need to copy the array

function array_change_key_case_recursive($input, $case = null) {
$case = $case ?: CASE_LOWER;
$input = array_change_key_case($input, $case);
foreach ($input as $key => $val) {
if (is_array($val))
$input[$key] = array_change_key_case_recursive($val, $case);
}
}

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