CODEWITHSUNDEEP
phparraysmultidimensional-array
atoms
atoms

Reputation: 3093

Update all array keys in multidimensional array using value from another array

I would like to replace all numerical keys in the multidimensional array $aValues with a textual equivalent stored in $aKeyNames.

$aKeyNames = array(0 => 'foo', 1 => 'bar');
$aValues = array( 
    0 => array( 0 => 'content relating to foo', 1 => 'content relating to bar' ), 
    1 => array( 0 => 'content relating to foo', 1 => 'content relating to bar') 
);

The desired output;

array (size=2)
  0 => 
    array (size=2)
      'foo' => string 'content relating to foo' (length=23)
      'bar' => string 'content relating to bar' (length=23)
  1 => 
    array (size=2)
      'foo' => string 'content relating to foo' (length=23)
      'bar' => string 'content relating to bar' (length=23)

To achieve this I've written the following working code;

foreach ($aValues as $iValuePos => $aValue) {
    foreach ($aValue as $iKey => $sTempValue){
        $aValues[$iValuePos][ $aKeyNames[$iKey] ] = $sTempValue;
        unset($aValues[$iValuePos][$iKey]);
    }
}

My concern is that $aValues is very large. Is there a more efficient way to achieve this?

Please note this question is different to the one provided as a duplicate due to the use of a multidimensional array.

Upvotes: 0

Views: 70

Answers (2)

AbraCadaver
AbraCadaver

Reputation: 78984

I haven't bench-marked but it should be faster:

$aValues = array_map(function($v) use ($aKeyNames) {
                         return array_combine($aKeyNames, $v);
                     }, $aValues);

Another alternative using a reference & to the value:

foreach($aValues as &$v) {
    $v = array_combine($aKeyNames, $v);
}

Upvotes: 1

istaro
istaro

Reputation: 139

Try this:

$aKeyNames = array(0 => 'foo', 1 => 'bar');

$aValues = array( 
    0 => array( 0 => 'content relating to foo', 1 => 'content relating to bar' ), 
    1 => array( 0 => 'content relating to foo', 1 => 'content relating to bar') 
);

foreach ($aValues as $iValuePos => $aValue) {
    $aValues[$iValuePos] = array_combine($aKeyNames, $aValue);
}

Upvotes: 1

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