Extracting keys (stored in child array) from an array

Question

I have a PHP array as:

$array = [
    ['key' => 'foo', 'value' => 'fooVal'],
    ['key' => 'bar', 'value' => 'barVal'],
];

Is there an easy way of extracting the keys so that I have ['foo', 'bar'] or I must loop through $array?

Possible duplicate of Is there a function to extract a 'column' from an array in PHP? — Nigel Ren
– Nigel Ren, Commented Jun 10, 2018 at 16:34

Eddie · Accepted Answer · 2018-06-10 15:48:13Z

1

You can use array_column to get values of a single column from an array

$array = [
    ['key' => 'foo', 'value' => 'fooVal'],
    ['key' => 'bar', 'value' => 'barVal'],
];

$result = array_column( $array , 'key' ); 

echo "<pre>";
print_r( $result );
echo "</pre>";

This will result to:

Array
(
    [0] => foo
    [1] => bar
)

Doc: array_column()

answered Jun 10, 2018 at 15:48

Eddie

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