In what situations should functions be considered for refactoring PHP code to improve readability and maintainability?

Functions should be considered for refactoring PHP code when there are repetitive blocks of code that can be grouped together, when the code is becoming too long and complex, or when there are specific tasks that can be encapsulated for better organization and reusability. Refactoring code into functions can improve readability, maintainability, and help in reducing code duplication. 

// Before refactoring with functions
$firstName = "John";
$lastName = "Doe";

echo "Hello, my name is " . $firstName . " " . $lastName . ".";
echo "I am " . (2022 - 1985) . " years old.";

// After refactoring with functions
function getFullName($firstName, $lastName) {
    return $firstName . " " . $lastName;
}

function calculateAge($birthYear) {
    return 2022 - $birthYear;
}

$firstName = "John";
$lastName = "Doe";
$birthYear = 1985;

echo "Hello, my name is " . getFullName($firstName, $lastName) . ".";
echo "I am " . calculateAge($birthYear) . " years old.";

Keywords

refactoring PHP code readability maintainability functions

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