Is there a PHP function like array_column that only returns single values?

Question

I am looping through instances of associative arrays (these associative arrays themselves are part of an array).

For each array I want to return a value, based on a key.

Currently I have:

$image_path = array_column($myarray, 'uri');

But of course array_column stores its values in a array, which, considering it's only returning 1 value, is useless to me.

Is there an existing function that will allow me to just get a value based off a supplied key?

Eg:

$image_path = get_keys_value($myarray, 'uri');

Example array. This is a very basic example. The real thing has many levels to it:

$myarray = array
  (
    'instance' => array(
      'type' => 'somedata',
      'content' => somedata',
      'image' => array(
         'name' => 'photo',
         'uri' => 'path/to/file.png'
      ),
    ),
  );

Desired outcome:

$image_path contains 'path/to/file.png' string.

@Swapper no, I want to return the value that is associated with the key 'uri', eg: uri => some/path/to/image.png — MeltingDog
– MeltingDog, Commented Mar 31, 2017 at 7:01
$myarray['instance']['image']['uri'] -- why do you need a function to get it? — axiac
– axiac, Commented Mar 31, 2017 at 7:12

Rahul · Accepted Answer · 2017-03-31 07:15:35Z

1

Try this,

function array_column_recursive(array $haystack, $needle)
{
    $found = [];
    array_walk_recursive($haystack, function ($value, $key) use (&$found, $needle) {
        if ($key == $needle) {
            $found[] = $value;
        }
    });
    return $found;
}
echo array_column_recursive($myarray, 'uri')[0];

Here is working code.

array_column will work with only 2 level array structure.

Above array will solve your problem.

I hope this will help

answered Mar 31, 2017 at 7:15

Rahul

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8 Comments

MeltingDog Over a year ago

Hmm I just get the error message 'cannot redeclare: array_column_recursive'

Rahul Over a year ago

you may already have that function, do one thing rename it array_column_recursive1 and replace this name in calling code. and check

MeltingDog Over a year ago

Weird, no matter what I name it it just says there's a problem with the line the echo is on as its already 'declared' on the line the function is on

Rahul Over a year ago

echo array_column_recursive1($myarray, 'uri')[0]; you sure you did this ?

MeltingDog Over a year ago

Yep I am. It just doesnt seem to like referring to the same function twice

|

Sergey Chizhik · Accepted Answer · 2017-03-31 08:02:43Z

I guess you can use array_map.

Ex:

$arr = [
    [
        'root' => [
            'child1' => [
                'child2' => 123
            ]
        ]
    ],
    [
        'root' => [
            'child1' => [
                'child2' => 456
            ]
        ]
    ],
    [
        'root' => [
            'child1' => [
                'child2' => 789
            ]
        ]
    ],
    [
        'root' => [
            'child1' => [
                'child2' => 123
            ]
        ]
    ],
];

print_r(array_map(function($row) {
    // here goes expression to get required path
    return $row['root']['child1']['child2'];
}, $arr));

Output:

Array
(
    [0] => 123
    [1] => 456
    [2] => 789
    [3] => 123
)

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