push certain elements into array php

Question

I want to know that is there a way to insert certain elements of an array into a new array. I mean I have an array containing 10 objects. Each object has 3 or four fields for example id, name , age , username. now I want to insert the id's of all the objects into the new array with a single call.Is there anyway to do that.

$array = [ 
  [0] => [
      id   =>      
      name =>
  ],
  [1] = > [
      id   =>
      name =>
  ]
]

and so on now I want to insert all the id's of all the object into a new array with a single call. Is there a way to do that?

Why does it have to be a "single call"? That's a strange requirement — Clive
– Clive, Commented Jan 19, 2016 at 13:26

Ravi Hirani · Accepted Answer · 2016-01-19 13:32:43Z

1

Use array_map() function.

Here is your solution:-

 $ids = array_map( function( $arr ){
                    return $arr["id"];
                }, $arr );

 echo '<pre>'; print_r($ids);

answered Jan 19, 2016 at 13:32

Ravi Hirani

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6 Comments

Gardezi Over a year ago

can you tell me just one more thing that if I have multiple arrays, can I give all the arrays after the call back ??

Ravi Hirani Over a year ago

If all arrays have same structure then first merge them. Is array_map working for you?

Gardezi Over a year ago

I have not used it but I think it will do what I want. Let me check

Gardezi Over a year ago

I know I can merge them but just for knowledge can I give it multiple arrays having same structure ?

Ravi Hirani Over a year ago

No you can not pass multiple array within same function for same operation.

|

Tewdyn · Accepted Answer · 2016-01-19 13:31:01Z

0

A basic foreach loop will do the job just fine

$firstArray = array(
  array(
    'id' => 1,
    'name' => 'abc'
  ),
  array(
    'id' => 2,
    'name' => 'def'
  ),
  array(
    'id' => 3,
    'name' => 'gh'
  )
);

$onlyIds = array();
$onlyKeys = array();

//To get the array value 'id'
foreach($firstArray as $value){
  $onlyIds[] = $value['id'];
}

//To get the array keys
foreach($firstArray as $key => $value){
  $onlyKeys[] = $key;
}

answered Jan 19, 2016 at 13:31

Tewdyn

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1 Comment

Gardezi Over a year ago

I know a simple for loop will be fine but it's a requirement that I do it with a single call

user2762134 · Accepted Answer · 2016-01-19 13:32:56Z

0

You could use array_walk which could be considered a "single call"

$array = array(0 => array('id', 'name', 'age'), 1 => array('id', 'name', 'age'));
array_walk($array, function($item, $key) {
    // $key is 0 or 1
    // $item is either id, name, age
});

answered Jan 19, 2016 at 13:32

user2762134

Comments

Geoffrey · Accepted Answer · 2016-01-19 13:33:54Z

0

You can use array_column.

$arr = [ ['id' => 1, 'username' => 'a'], ['id' => 2, 'username' => 'b'] ];
$ids = array_column($arr, 'id')
$ids == [1, 2]

answered Jan 19, 2016 at 13:33

Geoffrey

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