Add array values at the start of each subArray from other array

Question

I have two arrays, $array1 and $array2, now I want to take the values from $array2 and put each element at the start of each subArray from $array1

First array:

$array1 = Array (
    [0] => Array (
            [0] => 2
            [1] => 6
            [2] => 15 
            [3] => 6               
    )   
    [1] => Array (
            [0] => 5
            [1] => 8
            [2] => 6
            [3] => 12

    )    
    [2] => Array (
            [0] => 2
            [1] => 5
            [2] => 5
            [3] => 5             
    )    
)

Second array:

$array2 = Array (
    [0] => Outlook
    [1] => Temp
    [2] => Humidity        
)

Expected output (modified/new values bold):

$array1 = Array (
    [0] => Array (
            [0] => 'Outlook'
            [1] => 2
            [2] => 6
            [3] => 15 
            [4] => 6        
    )
    [1] => Array ( 
            [0] => 'Temp'
            [1] => 5
            [2] => 8
            [3] => 6
            [4] => 12         
    )
    [2] => Array (
            [0] => 'Humidity'
            [1] => 2
            [2] => 5
            [3] => 5
            [4] => 5            
    )
)

Possible duplicate of PHP append one array to another (not array_push or +) — izk
– izk, Commented Mar 25, 2016 at 10:53
i cant not understand how i can do this how i merge two array as i want — ali
– ali, Commented Mar 25, 2016 at 11:01
You can do this multiple ways. 1) Take a look at foreach and loop through your second array. Plus look at array_unshift() 2) Or you look at array_map() and at array_unshift(). Read the pages carefully, look at the examples, try to write some code, and if you get stuck post the attempt here. And we will help you to finish it :) — Rizier123
– Rizier123, Commented Mar 25, 2016 at 11:05
@baboizk Op wants to merge the array differently than described in the dupe. — Rizier123
– Rizier123, Commented Mar 25, 2016 at 11:09

fusion3k · Accepted Answer · 2016-03-25 11:32:17Z

1

You can use array_walk() with anonymous function and array_unshift():

array_walk
(
    $array1,
    function( &$row, $key, $kind )
    {
        array_unshift( $row, $kind[$key] );
    },
    $array2 
);

eval.in demo

array_walk() modify an array using a custom function. The callable function arguments are the array item (note that we have to set it by reference using &), the array key (optional) and an optional custom parameter (in our case, $array2). Inside the function, with array_unshift()) we can prepend to each item the relative $array2 item, selecting it by key $key.

Read more about array_walk()
Read more about array_unshift()
Read more about anonymous functions
Read more about passing by reference

edited Mar 25, 2016 at 11:32

answered Mar 25, 2016 at 11:25

fusion3k

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4 Comments

ali Over a year ago

sir its not worked like i mention in question its give offset error

ali Over a year ago

just sir i have a minor problem actually above i mention $array2 thats start with index zero actually my $array2 is started index one like bellow $array2 = Array ( [1] => Outlook [2] => Temp [3] => Humidity )

ali Over a year ago

sir my $array2 is start from index 1 not 0 .thats why i face offset error kindly guide me

fusion3k Over a year ago

You can use $array2 = array_values( $array2 ) to reset keys.

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