Getting the key of the only element in a PHP array

Question

The key of the associative array is dynamically generated. How do I get the "Key" of such an array?

$arr = array ('dynamic_key' => 'Value');

I am aware that It is possible to access it through a foreach loop like this:

foreach ($arr as $key => $val) echo "Key value is $key";

However, I know that this array will have only one key and want to avoid a foreach loop. Is it possible to access the value of this element in any other way? Or get the key name?

Answer 1

edit: http://php.net/each says:

each

Warning This function has been DEPRECATED as of PHP 7.2.0. Relying on this function is highly discouraged.

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Using key() is fine.
If you're going to fetch the value anyway you can also use each() and list().

$arr = array ('dynamic_key' => 'Value');
list($key, $value) = each($arr);
echo $key, ' -> ', $value, "\n";

prints dynamic_key -> Value