php index of last element in array

1<?php
2
3$source_array = ['key1' => 'value1', 'key2' => 'value2', 'key3' => 'value3'];
4
5$result = end($source_array);
6
7echo "Last element: ".$result;
8
9?>

1<?php
2
3$source_array = [
4  'key1' => 'value1',
5  'key2' => 'value2',
6  'key3' => 'value3'
7];
8
9echo "Last index: " . array_key_last($source_array);
10
11?>