How can I output a value from an array?

Question

array(7) {
  [0]=>
  array(2) {
    ["name"]=>
    string(14) "form[username]"
    ["value"]=>
    string(1) "1"
  }

  [1]=>
  array(2) {
    ["name"]=>
    string(15) "form[is_active]"
    ["value"]=>
    string(1) "1"
  }

  [2]=>
  array(2) {
    ["name"]=>
    string(8) "form[id]"
    ["value"]=>
    string(1) "9"
  }
 }

I want to get the id from an array. The output I like to achive is 9.

My approach:

echo $array['form[id]'];

But I don't get an output.

your id is a part of a value string and is nota index key .. — ScaisEdge, Aug 15 '18 at 09:35
If as you say _I cannot take the number like "2" because, in some cases the id is not on position 2_ Then you will have to loop and check for array occurance `$a["name"] == 'form[id]'` — RiggsFolly, Aug 15 '18 at 09:37
Ok, I understand, maybe then it is only possible with a loop — peace_love, Aug 15 '18 at 09:39

Dirk Scholten · Answer 1 · 2018-08-15T09:48:56.810

4

When you use $array['form[id]']; you are looking for the key called 'form[id]' which will not work because the keys of your array are 0, 1 and 2. You can get your desired value by using $array[2]['value']. However this will always call the 2nd element of your array, which might not be what you want. A more dynamic solution would be something like this:

foreach ($array as $element) {
    if ($element['name'] == 'form[id]') {
        echo $element['value'];
        break;
    }
}

This will loop through your whole array and check the names of each element. Then when it matches your desired name it will print the value for that exact element.

edited Aug 15 '18 at 09:48

answered Aug 15 '18 at 09:38

Dirk Scholten

1,013
10
19

2

You probably want to `break;` after you found it to stop iterating. – Xatenev Aug 15 '18 at 09:40
Good point. Added it! – Dirk Scholten Aug 15 '18 at 09:41

score 3 · Accepted Answer · answered Aug 15 '18 at 09:39

3

The easiest way might be to just first re-index the array using array_column. Then you can use the name field as the key:

$array = array_column($array, null, 'name');

echo $arr['form[id]']['value'];
// 9

See https://3v4l.org/L1gLR

answered Aug 15 '18 at 09:39

iainn

16,826
9
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40

that is the way to go :), although i dont find any need to use array like him, he can simply do like https://3v4l.org/puGKm – NullPoiиteя Aug 15 '18 at 10:17

score 2 · Answer 3 · edited Aug 15 '18 at 09:53

2

You could use a foreach and check for the content .. but the content for index 'name' is just a string form[id] anyway

foreach( $myArray AS $key => $value){

   if ($value['name'] == 'form[id]' ) {
      echo $key;
      echo $value;

   }


}

edited Aug 15 '18 at 09:53

NullPoiиteя

56,591
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answered Aug 15 '18 at 09:38

ScaisEdge

131,976
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You probably want to `break;` after you found it to stop iterating. – Xatenev Aug 15 '18 at 09:40
@Xatenev thanks .. is valid suggestion .. correct .. the OP can use break for end the iteration when match – ScaisEdge Aug 15 '18 at 09:41

Erik Terwan · Answer 4 · 2018-08-15T09:46:56.093

1

You are trying to get the value as if it's an associative array (sometimes called a dictionary or map), however it's a plain or indexed array.

Get the value you want by calling $array[2]["value"]

You can also use some of the higher level functions such as array_search; then you could use:

$id = array_search(function($values) {
  return $values['name'] == 'form[id]';
}, $array)["value"];

edited Aug 15 '18 at 09:46

answered Aug 15 '18 at 09:34

Erik Terwan

2,710
19
28

The problem is, I cannot take the number like "2" because, in some cases the id is not on position 2 – peace_love Aug 15 '18 at 09:35
Ah yes then you should loop through the array and get the `value` when the `name` value is `form[id]` – Erik Terwan Aug 15 '18 at 09:36

score 0 · Answer 5 · answered Aug 15 '18 at 09:51

So I think you need to filter the array to find the element you need first, then output that element's value:

$filtered_array = array_filter($your_array, function(element){
   return element['name'] == 'form[username]';
});

if (!empty($filtered_array)) {
   echo array_pop($filtered_array)['value'];
}

How can I output a value from an array?

5 Answers5