How to solve the problem of duplicate code in PHP functions?

By encapsulating duplicate code, functions and closures can be used to eliminate redundancy in the code. Functions encapsulate repetitive tasks into reusable units, closures encapsulate repetitive code, and can access scope variables outside the function. In the actual case, we encapsulate the repeated email sending code into a function to avoid duplication and redundancy.

#How to eliminate duplicate code in PHP functions?

Duplicate code not only makes your code look cluttered, but also makes it harder to maintain and update. PHP provides several ways to resolve duplicate code, such as functions and closures.

Function Reuse

One common use of functions is to encapsulate repetitive tasks. Consider the following example, where there is repeated code for calculating the sum of two numbers:

function sum($a, $b) {
    $total = $a + $b;
    return $total;
}

$x = sum(1, 2);
$y = sum(3, 4);

Using functions, we can encapsulate the repeated calculation code into a reusable function:

function sum($a, $b) {
    return $a + $b;
}

$x = sum(1, 2);
$y = sum(3, 4);

Closures

Closures are another powerful technique for encapsulating repetitive code. Closures are anonymous functions that can access scope variables from outside the function. Consider the following example where there is duplicate code for formatting a string:

function formatName($first, $last) {
    $name = $first . " " . $last;
    return $name;
}

$fullName1 = formatName("John", "Doe");
$fullName2 = formatName("Jane", "Smith");

Using closures, we can encapsulate the duplicate formatting code into a reusable closure:

$formatName = function($first, $last) {
    return $first . " " . $last;
};

$fullName1 = $formatName("John", "Doe");
$fullName2 = $formatName("Jane", "Smith");

Practical Case

The following is a practical case to illustrate how to encapsulate repeated code into a function:

// 重复的代码
function sendEmail($to, $subject, $body) {
    // 发送电子邮件的代码
}

function sendOrderConfirmationEmail($orderInfo) {
    sendEmail("customer@example.com", "订单确认", "您的订单已确认...");
}

function sendShippingNotificationEmail($shippingInfo) {
    sendEmail("customer@example.com", "发货通知", "您的订单已发货...");
}

By encapsulating the repeated sending email code into sendEmail In the function, we avoid duplication and redundancy of code:

function sendEmail($to, $subject, $body) {
    // 发送电子邮件的代码
}

function sendOrderConfirmationEmail($orderInfo) {
    sendEmail("customer@example.com", "订单确认", "您的订单已确认...");
}

function sendShippingNotificationEmail($shippingInfo) {
    sendEmail("customer@example.com", "发货通知", "您的订单已发货...");
}

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