How can callback methods be utilized in PHP to compare elements of multidimensional arrays effectively?

When comparing elements of multidimensional arrays in PHP, callback methods can be utilized to define custom comparison logic. By using callback methods, we can compare elements based on specific criteria or conditions, making the comparison process more flexible and effective. 

// Sample multidimensional array
$students = [
    ['name' => 'Alice', 'age' => 20],
    ['name' => 'Bob', 'age' => 22],
    ['name' => 'Charlie', 'age' => 18]
];

// Custom callback function to compare elements based on age
function compareAge($a, $b) {
    return $a['age'] - $b['age'];
}

// Using usort() function with custom callback to compare elements based on age
usort($students, 'compareAge');

// Output sorted array based on age
print_r($students);

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