wp_is_numeric_array

Determines if the variable is a numeric-indexed array.

function wp_is_numeric_array( $data ) {
	if ( ! is_array( $data ) ) {
		return false;
	}

	$keys        = array_keys( $data );
	$string_keys = array_filter( $keys, 'is_string' );

	return count( $string_keys ) === 0;
}