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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?

marcdefiant

<?php
$i = array(
    array(
        'Amount' => 1,
        'Measurement' => 'Cup',
        'Ingredient' => 'Sugar',
        'Notes' => 'Some comments'
    ),
    array(
        'Amount' => 2,
        'Measurement' => 'Cups',
        'Ingredient' => 'Flour',
        'Notes' => 'Some comments'
    )
);

$key = array_keys($i);
foreach($key as $ki){
    $klower = strtolower($ki);
    $val = $i[$ki];
    if(is_array($val)){
        foreach($val as $kinner => $vinner){
            $tl = strtolower($kinner);
            unset($val[$kinner]);
            $val[$tl] = $vinner;
        }
    }
    unset($i[$ki]);
    $i[$klower] = $val;
}
?>

seems to work like a charm

Credit: http://www.php.net/manual/en/function.array-change-key-case.php#106233

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!

jamy_za

<?php
	$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...

<?php

	$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 '<br />';
	}

?>

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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[Solved] How to make array key lowercase?