What is the role of PHP functions in development?

PHP functions are a set of predefined code blocks used to perform specific tasks, bringing the following benefits: code reuse; modularization; improved efficiency.

The role of PHP functions in development

PHP functions are a set of predefined blocks of code used to perform specific tasks . They can greatly simplify and optimize your development workflow, bringing the following benefits:

• Code Reuse: Functions allow you to package blocks of code into reusable units, thereby avoiding Repeatedly writing lengthy or common code.
• Modularization: Functions break code into smaller, independent modules, making it easier to manage, understand, and maintain.
• Improve efficiency: Functions can make your code more efficient, reducing the time and effort you need to write and maintain your code.

Practical case: connecting to the database

The following is an example of using the PHP function to connect to the MySQL database:

<?php
function connect_db() {
  $servername = "localhost";
  $username = "username";
  $password = "password";
  $dbname = "database";

  // 创建连接
  $conn = new mysqli($servername, $username, $password, $dbname);

  // 检查连接是否成功
  if ($conn->connect_error) {
    die("连接失败：" . $conn->connect_error);
  }

  return $conn;
}

// 使用连接函数
$conn = connect_db();

// 执行 SQL 查询
$result = $conn->query("SELECT * FROM users");

// 输出查询结果
while ($row = $result->fetch_assoc()) {
  echo $row["id"] . " " . $row["name"] . "<br>";
}

// 关闭连接
$conn->close();

This function encapsulates All steps required to connect to the database. It can be called from any script, giving you a simple, reusable way to interact with your database.

The above is the detailed content of What is the role of PHP functions in development?. For more information, please follow other related articles on the PHP Chinese website!