How to merge all the nested array values having same keys

Question

I'm having an array like this,

Array
(
    [0] => Array
        (
            [0] => m_res1
            [1] => m_res2
        )

    [1] => Array
        (
            [0] => images
            [1] => pcgc_desc
            [2] => The_US_GRANT_A_Luxury_Collection_Hotel_usn_2
        )

    [2] => Array
        (
            [0] => Australis
        )

    [3] => Array
        (
            [0] => Greece
            [1] => download
        )

    [4] => Array
        (
            [0] => Studio
        )

)

I would like to get like this..

Array
(
    [0] => m_res1
    [1] => m_res2
    [2] => images
    [3] => pcgc_desc
    [4] => The_US_GRANT_A_Luxury_Collection_Hotel_usn_2
    [5] => Australis
    [6] => Greece
    [7] => download
    [8] => Studio
)

i.e:, merge the nested array values and make it as an one array..

Is this possible?

Dhaval Bharadva · Accepted Answer · 2016-04-27 08:19:47Z

1

You can use the Standard PHP Library (SPL) In case the original array has a higher depth than 2 levels, the SPL in PHP has a RecursiveArrayIterator you can use to flatten it:

$finalArray = array();
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($a)); //$a is your multidimentional original array
foreach($iterator as $v) {
    $finalArray[] = $v;
}
echo "<pre>";
print_r($finalArray);  //print your array
echo "</pre>";

output:

Array
(
    [0] => m_res1
    [1] => m_res2
    [2] => images
    [3] => pcgc_desc
    [4] => The_US_GRANT_A_Luxury_Collection_Hotel_usn_2
    [5] => Australis
    [6] => Greece
    [7] => download
    [8] => Studio
)

Note: Alternatively you can use call_user_func_array('array_merge', $a); to flatten your array but it will only work with 2 levels depth.

Explaination:

$a = Array(
    Array("m_res1","m_res2"),
    Array("images","pcgc_desc","The_US_GRANT_A_Luxury_Collection_Hotel_usn_2"),
    Array("Australis"),
    Array("Greece","download"),
    Array("Studio"),
    Array(
        Array("3rd Level")
        )
    );

$finalArray = call_user_func_array('array_merge', $a);

echo "<pre>";
print_r($finalArray);  //print your array
echo "</pre>";

output:

Array
(
    [0] => m_res1
    [1] => m_res2
    [2] => images
    [3] => pcgc_desc
    [4] => The_US_GRANT_A_Luxury_Collection_Hotel_usn_2
    [5] => Australis
    [6] => Greece
    [7] => download
    [8] => Studio
    [9] => Array
        (
            [0] => 3rd Level
        )

)

edited Apr 27, 2016 at 8:19

answered Apr 27, 2016 at 7:54

Dhaval Bharadva

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5 Comments

Suganya Rajasekar Over a year ago

'@Dhaval Bharadva'what you mean 2 levels depth!!... I can't understand

Dhaval Bharadva Over a year ago

@SuganyaRajasekar If your array contains one more dimentional level then call_user_func_array('array_merge', $a); will not merge that level.

Suganya Rajasekar Over a year ago

you mean you specify the main array or sub (nested)arrays??

Dhaval Bharadva Over a year ago

@SuganyaRajasekar please check my updated answer so you will get clear idea about use of RecursiveArrayIterator instead of array_merge.

Suganya Rajasekar Over a year ago

@Dhaval BharadvaNow I get clear vision of it.. :) But My array never won't be like this.. :) :) Anyways...Thank you soo much for your Idea & answer

Rajdeep Paul · Accepted Answer · 2016-04-27 07:53:53Z

1

You can do something like this to convert the associative array to a normal array,

// Here $arr is your original array
$result_array = call_user_func_array('array_merge', $arr);

// display $result_array
echo "<pre>";
print_r($result_array);
echo "</pre>";

Output:

Array
(
    [0] => m_res1
    [1] => m_res2
    [2] => images
    [3] => pcgc_desc
    [4] => The_US_GRANT_A_Luxury_Collection_Hotel_usn_2
    [5] => Australis
    [6] => Greece
    [7] => download
    [8] => Studio
)

Here are the relevant references:

edited Apr 27, 2016 at 7:53

answered Apr 27, 2016 at 7:41

Rajdeep Paul

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Comments

Jatin Raikwar · Accepted Answer · 2016-04-27 08:01:16Z

1

Use like this

$main = array();
foreach($arr as $key => $arrsub)
{
    foreach($arrsub as $key => $value)
    {
        array_push($main,$value);
    }
}
echo "<pre>";
print_r($main);
echo "</pre>";

for more information regarding array_push

http://php.net/manual/en/function.array-push.php

answered Apr 27, 2016 at 8:01

Jatin Raikwar

3946 silver badges17 bronze badges

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