Practical tips on the underlying development principles of PHP7: methods to optimize code performance and resource utilization

Practical tips on the underlying development principles of PHP7: methods to optimize code performance and resource utilization

Introduction:
PHP7 is a popular server-side scripting language. Its performance and resource utilization have always been concerns of developers. In order to optimize the performance and resource utilization of the code, we need to understand the underlying development principles of PHP7 and learn some practical skills. This article will introduce several methods to optimize PHP7 code performance and resource utilization, and give corresponding code examples.

1. Use the latest version of PHP7
PHP7 introduces many new features and improvements, including higher performance and lower memory usage. Therefore, using the latest PHP7 version is the first step to optimize code performance and resource utilization. You can download the latest PHP7 version from the PHP official website and upgrade it.

2. Use OPcache extension
OPcache is a built-in extension of PHP. It can cache the bytecode of PHP scripts to reduce the compilation overhead every time the script is executed. Using OPcache can improve the performance of your PHP code and reduce your server's memory usage. The following is a code example using OPcache extension:

// 在PHP脚本的开头添加以下代码
if (function_exists('opcache_reset')) {
    opcache_reset();
}

// 配置OPcache
opcache.enable=1
opcache.enable_cli=1
opcache.memory_consumption=128
opcache.max_accelerated_files=10000
opcache.validate_timestamps=0

3. Reasonable use of cache
Using cache can reduce the number of accesses to the database and file system, and improve the performance and resource utilization of the code. In PHP7, this can be achieved using caching systems such as Memcached or Redis. The following is a code example that uses Memcached to cache data:

// 连接Memcached服务器
$memcache = new Memcached();
$memcache->addServer('localhost', 11211);

// 查找缓存中的数据
$data = $memcache->get('data');

// 如果缓存中没有数据，则从数据库中获取数据，并存入缓存
if ($data === false) {
    $data = // 从数据库中获取数据的代码
    $memcache->set('data', $data, 3600);
}

// 使用数据
echo $data;

4. Reduce database and file system access
Database and file system access is usually one of the main causes of web application performance bottlenecks. In order to reduce the number of accesses, we can use the following methods:

1. Batch query data: merge multiple queries into one query to reduce the number of database accesses. The following is a code example for querying data in batches:

// 执行多个查询
$query1 = "SELECT * FROM table1";
$query2 = "SELECT * FROM table2";
$query3 = "SELECT * FROM table3";
$results1 = mysqli_query($conn, $query1);
$results2 = mysqli_query($conn, $query2);
$results3 = mysqli_query($conn, $query3);

// 处理查询结果
// ...

2. Use database indexes: Adding appropriate indexes to tables in the database can speed up queries. The following is a code example for adding an index:

// 创建索引
CREATE INDEX index_name ON table_name (column1, column2, ...);

3. Use file cache: Storing frequently accessed data in files can reduce database access. The following is a code example that uses files to cache data:

// 从文件缓存中获取数据
$file = 'cache.json';
if (file_exists($file)) {
    $data = file_get_contents($file);
} else {
    $data = // 从数据库中获取数据的代码
    file_put_contents($file, $data);
}

// 使用数据
echo $data;

5. Use correct data structures and algorithms
Using correct data structures and algorithms can improve the performance and resource utilization of the code. For example, using appropriate data structures can improve the efficiency of searching and sorting. The following is a code example that uses a binary search tree to find data:

// 定义二叉搜索树节点
class TreeNode {
    public $val;
    public $left;
    public $right;
    
    public function __construct($val) {
        $this->val = $val;
        $this->left = null;
        $this->right = null;
    }
}

// 在二叉搜索树中查找指定的值
function searchBST($root, $val) {
    if ($root == null || $root->val == $val) {
        return $root;
    }
    
    if ($root->val < $val) {
        return searchBST($root->right, $val);
    }
    
    if ($root->val > $val) {
        return searchBST($root->left, $val);
    }
}

// 使用二叉搜索树查找数据
$root = // 构建二叉搜索树的代码
$target = // 要查找的值
$result = searchBST($root, $target);

// 输出结果
echo $result;

Conclusion:
By learning the underlying development principles of PHP7 and using optimization techniques, we can improve the performance and resource utilization of the code. This article introduces several methods to optimize PHP7 code performance and resource utilization, and gives corresponding code examples. I hope this article will help you optimize PHP7 code in actual development. Remember, continuous learning and practice are the keys to improving your skills.

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