Extract inner array from a PHP associative array using some external keys

Question

I have a array $a and some key arrays e.g. $keys1, $keys2,....

$a = array('a'=>array('b'=>array('c'=>array('d'=>123,'s'=>4),'r'=>3),'q'=>2),'p'=>1);

$keys1 = array('a','b','c');

$keys2 = array('a','b');

$a =  Array
    (
        [a] => Array
            (
                [b] => Array
                    (
                        [c] => Array
                            (
                                [d] => 123
                                [s] => 4
                            )

                        [r] => 3
                    )

                [q] => 2
            )

        [p] => 1
    )

whenever $keys1 is used, output should be

Array
(
    [d] => 123
    [s] => 4
)

or whenever $keys2 is used, output should be

Array
(
  [c] => Array
    (
        [d] => 123
        [s] => 4
    )
)

this is very simple I can achieve result by using $a[a][b][c] in first case and by using $a[a][b] in second case

Problem: these $keys are provided in form of array at run time, Is there any function in php to get the result?

Is something wrong with my answer then please say so. I'd be happy to fix it. — Andreas
– Andreas, Commented Sep 15, 2017 at 7:03
there is nothing wrong in your answer, actually I was searching for a bulid in php function — bornTalented
– bornTalented, Commented Sep 15, 2017 at 9:42

Andreas · Accepted Answer · 2017-09-14 08:09:54Z

1

Try this.
Comments are in code.

It will loop through the keys and return the searched value.

$a = array('a'=>array('b'=>array('c'=>array('d'=>123,'s'=>4),'r'=>3),'q'=>2),'p'=>1);

$keys1 = array('a','b','c');

$keys2 = array('a','b');
$keys = $keys1; // set this as "search value"

$value = $a; // create a copy of original array. Maybe not needed?
Foreach($keys as $key){ // loop keys in search value
    $value = $value[$key]; // overwrite $value with subarray of $value[$key]
}

Var_dump($value); // dump the search return.

https://3v4l.org/ZHBMa

edited Sep 14, 2017 at 8:09

answered Sep 14, 2017 at 7:58

Andreas

24k7 gold badges34 silver badges75 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Extract inner array from a PHP associative array using some external keys

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related