CODEWITHSUNDEEP
phparrays
Jerielle
Jerielle

Reputation: 7520

How to add new index and value from another array in PHP?

I need your help with my problem. My problem is I have 2 arrays the first one is the main array. The second is the array for my new data.

Let's say I have these arrays.

This is the main array:

Array
(
    0 => Array
        (
            'id' => 1,
            'name' => 'Apple',
            'age' => 12
         )

    1 => Array
        (
            'id' => 2,
            'name' => May,
            'age' => 13
         )
)

This is the second array:

Array
(
    1 => Array
        (
            'gender' => 'Male'
        )

    2 => Array
        (
            'gender' => 'Female'
        )

)

And I have this loop in PHP

foreach($main_array as &$main){

   //this is the loop inside the first array
   // how can I add the second array with it?

}

This is the sample output:

[0] => Array
    (
        [id] => 1
        [name] => Apple
        [age] => 12
        [gender] => Female
     )

[1] => Array
    (
        [id] => 2
        [name] => May
        [age] => 13
        [gender] => Female
     )

How can I do that? Any suggestions? That's all thanks.

Upvotes: 0

Views: 3285

Answers (5)

Ravindranath
Ravindranath

Reputation: 1

foreach($arr1 as $k => $arr1Item) {
   $arr1[$k]['gender'] = $arr2[$k]['gender'];
}

Upvotes: -1

Barry Staes
Barry Staes

Reputation: 4115

I fixed your example code, it wont run otherwise.

<?php

// Test data:
$main_array = Array(
  0 => Array(
    'id' => 1,
    'name' => 'Apple',
    'age' => 12
  ),
  1 => Array (
    'id' => 2,
    'name' => 'May',
    'age' => 13
  )
);
$lookup = Array(
  1 => Array(
    'gender' => 'Male'
  ),
  2 => Array(
    'gender' => 'Female'
  )
);

// Your answer:
foreach ($main_array as &$main) {
  if (array_key_exists($main['id'],$lookup)) {
    $main['gender'] = $lookup[$main['id']]['gender'];  // <-- sets gender value
  }
}

// Output it to browser:
echo '<pre>$main_array = '.print_r($main_array,true).'</pre>';

The array_key_exists() check is there to avoid errors such as PHP Notice: Undefined offset: 123 when the $lookup data is incomplete.

Upvotes: 1

Mihai Stancu
Mihai Stancu

Reputation: 16107

If you want to merge all of the data from both arrays:

PHP tools:

The exact behaviors of these functions needs to be studied and tested before usage, to make sure it fits your intent.

//  array merge recursive doesn't merge numeric keys
$main_array = array_merge_recursive($main_array, $secondary_array);

//  array replace recursive has a downside of replacing stuff
$main_array = array_replace_recursive($main_array, $secondary_array);

Rolling your own:

foreach($main_array as $i => &$main){
    if(isset($secondary_array[$i])) {
        foreach($secondary_array[$i] AS $key => $value) {
            $main[$key] = $value;
        }
    }
}

Both of the above solutions only apply if the array-indexes of $main_array and $secondary_array match.

In your example your arrays don't match: - $secondary_array[0] doesn't exist so $main_array[0] will not be populated with a 'gender' value; - $main_array[2] doesn't exist so $main_array[2] will be created and it will only have a 'gender' value same as $secondary_array[2]['gender']

If you want to only merge some bits and pieces of the arrays:

Rolling your own:

foreach($main_array as $i => &$main) {
    if(isset($secondary_array[$i])) and isset($secondary_array[$i]['gender'])) {
        $main['gender'] = $secondary_array[$i]['gender'];
    }
}

Upvotes: 1

Jerick Allan Sernal Dimaano
Jerick Allan Sernal Dimaano

Reputation: 321

for($i=0; $i<count($main_array); $i++){
    for($j=0; $j<count($second_array); $j++){
        if($main_array[$i]['id'] == $j){
            $main_array[$i]['gender'] = $second_array[$j]['gender']
        }
    }
}

Upvotes: 3

Alexey
Alexey

Reputation: 7247

foreach($main_array as &$main){//this is the loop inside the first array
    foreach($second_array as &$second){ //this is the loop inside the second array

    }
}

Upvotes: 0

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