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

Question

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.

Possible duplicate of Update all array keys using value from another array — b0ne
– b0ne, Commented Jun 28, 2016 at 14:44
This question is clearly different to that one (being my last question). As suggested on that thread I have created a new one! Thanks for not taking the time to read and marking as a duplicate... — atoms
– atoms, Commented Jun 28, 2016 at 14:53

AbraCadaver · Accepted Answer · 2016-06-28 15:09:00Z

1

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);
}

edited Jun 28, 2016 at 15:09

answered Jun 28, 2016 at 14:57

AbraCadaver

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6 Comments

atoms Over a year ago

looks good, going to benchmark with the other answer and will post back

atoms Over a year ago

getting an error back off this; array_combine(): Both parameters should have an equal number of elements

AbraCadaver Over a year ago

Which they do in your question. Maybe your real arrays are not what you show?

atoms Over a year ago

yeah spot on. This answer came out slightly faster than the one below. Thank you

AbraCadaver Over a year ago

It's about which is better not faster. Mine was actually slightly later than the other one.

|

istaro · Accepted Answer · 2016-06-28 14:55:54Z

1

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);
}

answered Jun 28, 2016 at 14:55

istaro

1491 silver badge12 bronze badges

1 Comment

atoms Over a year ago

thats great thank you! Will run a quick test using the data set and post back timings

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