PHP7 underlying development principles and practical experience: tips and strategies for implementing high-performance applications

Practical experience in the underlying development principles of PHP7: Tips and strategies for implementing high-performance applications

Introduction:
With the rapid development of the Internet, high-performance applications have become The goals pursued by major enterprises and development teams. When building high-performance applications, choosing the right development language and technology stack is particularly important. As a mature and widely used language, PHP7's underlying development principles and techniques can help us implement high-performance applications. This article will introduce some practical experiences and strategies, combined with code examples, to help readers better understand the underlying development principles of PHP7.

1. Use OPcache to improve performance
OPcache is an optimizer and caching tool built into PHP7 that can improve application performance by caching compiled PHP scripts. In the default configuration of PHP7, OPcache is turned on, but we can further optimize its performance through some configuration items. The following is a simple example code for using OPcache:

<?php
$opcacheStatus = opcache_get_status();
if ($opcacheStatus['opcache_enabled']) {
    echo 'OPcache is enabled!';
} else {
    echo 'OPcache is disabled!';
}

2. Make reasonable use of the new features of PHP7
PHP7 introduces many new features, such as scalar type declaration, return type declaration, and null value merging operator etc., can help us better control the logic and error handling of the code. Here is some sample code using the new features:

1. Scalar type declaration

<?php
function add(int $a, int $b): int {
    return $a + $b;
}

echo add(1, 2); // 输出 3
echo add(1.5, 2.5); // 报错

2. Return type declaration

<?php
function getName(): string {
    return 'John Doe';
}

echo getName(); // 输出 John Doe
echo getName() + 1; // 报错

3. Null value merging operator

<?php
$userName = $_POST['username'] ?? 'Guest';

echo $userName; // 若 $_POST['username'] 存在则输出其值，若不存在则输出 'Guest'

3. Use asynchronous programming to improve performance
In high-performance application development, asynchronous programming is a commonly used strategy. PHP7 introduces support for asynchronous programming. By using event loops and coroutines, non-blocking IO operations can be implemented when writing code, improving the concurrency capabilities of applications. The following is an example of asynchronous programming based on Swoole extension:

<?php
$server = new SwooleHttpServer('127.0.0.1', 9501, SWOOLE_BASE);

$server->on('Request', function ($request, $response) {
    $response->header('Content-Type', 'text/plain');
    $response->end("Hello World
");
});

$server->start();

4. Use caching technology to reduce IO overhead
One of the keys to high-performance applications is to reduce IO overhead. The use of caching technology can avoid frequent database access and file read and write operations, and improve the response speed of applications. The following is a simple example code for using Redis cache:

<?php
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

$key = 'user:123';
$user = $redis->get($key);

if ($user === false) {
    $user = fetchUserFromDatabase();
    $redis->set($key, $user);
}

echo $user;

Conclusion:
This article introduces some experience in the underlying development of PHP7 and explains it with code examples. By rationally utilizing the new features of OPcache, PHP7, asynchronous programming and caching technology, we can effectively implement high-performance applications. Of course, in addition to this, there are many other techniques and strategies that can be used to optimize the performance of PHP7 applications, which readers can explore and apply in practice. I hope this article will be helpful to readers in the underlying development of PHP7.

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