PHP switching two keys of an array

Question

I have an array:

$array['text6'] = array(
    'elem2' => 'text2',
    'elem3' => 'text3',
    'elem4' => 'text4',
    'elem5' => 'text5'
    'elem6' => 'text6'
);

And I would like to change, for example text6 key with other key in that way:

$name_key = 'elem4';

// something action here
// and final array:

    $array['text4'] = array(
        'elem2' => 'text2',
        'elem3' => 'text3',
        'elem5' => 'text5'
        'elem6' => 'text6'
    );

How I can do it? I have 105 arrays and I need to change every array in the same way, so when array looks that:

$array['text6'] = array(
    'elem2' => 'text2',
    'elem3' => 'text3',
    'elem4' => 'text4',
    'elem5' => 'text5'
    'elem6' => 'text6'
);

$array['othertext6'] = array(
    'elem2' => 'othertext2',
    'elem3' => 'othertext3',
    'elem4' => 'othertext4',
    'elem5' => 'othertext5'
    'elem6' => 'othertext6'
);

And I would like to change main key with key number three (key -> 'elem4'), it should make in every array (different beetwen arrays is only in value, keys are always the same):

$name_key = 'elem4';

// action...

$array['text4'] = array(
    'elem2' => 'text2',
    'elem3' => 'text3',
    'elem5' => 'text5'
    'elem6' => 'text6'
);

$array['othertext4'] = array(
    'elem2' => 'othertext2',
    'elem3' => 'othertext3',
    'elem5' => 'othertext5'
    'elem6' => 'othertext6'
);

How I can do it?

This is wrong way. You need nested list (children of nodes). — Deep
– Deep, Commented Dec 24, 2015 at 20:03
Look now, I edited my question. The main key is always in an array ('elem6' => 'text6'). I would like to remove main key and change for another key from an array and then - remove this key from an array. — NewbieUser
– NewbieUser, Commented Dec 24, 2015 at 20:09

Tim · Accepted Answer · 2015-12-24 20:40:44Z

2

If I'm understanding correctly, you'd like to set the key of an element in an array to a value of an element in a second array which is itself the value of the first key in the top-level array. Also, you want to remove that element from the second-level array.

Will the key of the top-level array always be changed to the value of the second-level with the same key?

That is, will 'elem4' always be the key for the value that should become the top-level array's key?

If so, you can do this:

First get all your arrays into one big array so you can loop through them.

$list = array($array['text4'], $array['text5'], ... (all your other arrays here));

Then,

$name_key = 'elem4';
foreach ($list as $k => $v) {
   $new_key =  $v[$name_key];
   unset ($v[$name_key]);
   $list[$new_key] = $v;
   unset ($list[$k]);
}

edited Dec 24, 2015 at 20:40

answered Dec 24, 2015 at 20:12

Tim

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3 Comments

Barmar Over a year ago

Instead of hard-coding 'elem4', use $name_key

NewbieUser Over a year ago

Are you sure, it's a good solution? The names of an values in main array is very important for me. I think, in your solution you removed all keys, yes?

Tim Over a year ago

@NewbieUser, In my solution, I am removing the key 'elem4' from each second-level array and setting the key for that array in the top-level array to the value of 'elem4' (or $name_key). If you want to keep that element ('elem4') in the second-level array, you can remove the line: unset ($v[$name_key]);

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