How to extract perticular array value from multidimentional array - php

Question

How can I get the list of all ids from the array given below,
$filteredZips=[{
"id": 21,
"distance": "0"
},
{
"id": 20,
"distance": "3.9399923305414037"
},
{
"id": 29,
"distance": "8.33045537474091"
}]
Expected result will be :
$id = array('21','20','29');

Answer 1

There is a function called array_column that will grab one column in an array.
First the string needs to be converted to array with Json_decode and second parameter to true.
Then array_column returns your expected output.
No looping is needed.
$filteredZips='[{
"id": 21,
"distance": "0"},{
"id": 20,
"distance": "3.9399923305414037"},{
"id": 29,
"distance": "8.33045537474091"}]';
$filteredZipsarr = json_decode($filteredZips,true);
$id = array_column($filteredZipsarr, "id");
Var_dump($id);
https://3v4l.org/hFOKR
If you don't need the $filteredZipsarr you can make it a one liner:
$id = array_column(json_decode($filteredZips,true), "id");

Answer 2

Use array_map function:
$id = array_map(function($value){
return $value['id'];
}, $filteredZips);
Documentation: http://php.net/manual/en/function.array-map.php

Answer 3

First you need to decode JSON string to access it as Array of Objects :
$filteredZips = json_decode($filteredZips);
$results = array();
foreach ($filteredZips as $zip) {
$results[] = $zip->id;
}
print_r($results);
Check here : https://3v4l.org/kfkhV

Answer 4

Use array_column after transform your JSON with json_decode
$ids = array_column(json_decode($filteredZips, true), 'id');
Array
(
[0] => 21
[1] => 20
[2] => 29
)

Answer 5

Solution:
$answer = [];
foreach($filteredZips as $array){
if(isset($array['id'])){
$answer[]=$array['id'];
}
}
var_dump($answer);

Answer 6

Try this:
$ids = array();
foreach ($filteredZips as $zip) {
$ids[] = $zip["id"];
}
var_dump($ids);
Dont forget to use json_decode function to get a proper php array.