What are the recommended debugging methods for identifying array keys in PHP structures?

To identify array keys in PHP structures, you can use the `array_keys()` function to retrieve all the keys of an array. This function returns an array containing all the keys of the input array. You can then use this array to debug and identify the keys present in the array structure.

$array = ['key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3'];

$keys = array_keys($array);

print_r($keys);