What are the advantages and disadvantages of using anonymous functions in programming?

Anonymous functions (closures) in PHP are functions without names that can be created on the spot and passed as values.

Advantages:

• Allow writing compact and expressive code, especially for callbacks and handlers.
• Can capture variables from the outer scope (closures), which is convenient for encapsulating logic.
• Simplify functional programming styles.

Disadvantages:

• Can reduce readability if too complex or nested anonymous functions are used.
• Debugging anonymous functions is more difficult because they lack a name.
• Improper use of closures can accidentally hold references to objects or data, causing memory leaks.

Example of an anonymous function in PHP:

$numbers = [1, 2, 3, 4];
$squared = array_map(function($n) {
    return $n * $n;
}, $numbers);
print_r($squared); // [1, 4, 9, 16]

Thus, anonymous functions are convenient for local logic and functional operations but require careful use.