<?php

// Original associative array
$ages = [
    "Peter" => 35,
    "Ben" => 37,
    "Joe" => 43,
    "Amy" => 29
];

echo "Original Array:
";
print_r($ages);

// Sort by value (ascending), maintaining key-value pairs
asort($ages);
echo "
Sorted by Value (Ascending):
";
print_r($ages);

// Sort by key (ascending), maintaining key-value pairs
ksort($ages);
echo "
Sorted by Key (Ascending):
";
print_r($ages);

// Reverse sort by value (descending)
arsort($ages);
echo "
Sorted by Value (Descending):
";
print_r($ages);

// Reverse sort by key (descending)
krsort($ages);
echo "
Sorted by Key (Descending):
";
print_r($ages);

?>