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php实现简单的

2026-02-16 17:55:17PHP

PHP实现简单的功能

PHP是一种广泛使用的服务器端脚本语言，适合开发简单的Web应用。以下是一些常见功能的实现方法：

表单处理

创建一个简单的表单并处理提交数据：

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = htmlspecialchars($_POST['name']);
    echo "Hello, " . $name;
}
?>
<form method="post">
    Name: <input type="text" name="name">
    <input type="submit">
</form>

数据库连接

连接MySQL数据库并查询数据：

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT id, name FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["name"]. "<br>";
    }
} else {
    echo "0 results";
}
$conn->close();
?>

文件上传

实现简单的文件上传功能：

<?php
if ($_FILES["file"]["error"] == UPLOAD_ERR_OK) {
    $target_dir = "uploads/";
    $target_file = $target_dir . basename($_FILES["file"]["name"]);

    if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {
        echo "File uploaded successfully.";
    } else {
        echo "Error uploading file.";
    }
}
?>
<form method="post" enctype="multipart/form-data">
    Select file: <input type="file" name="file">
    <input type="submit">
</form>

会话管理

使用PHP会话实现简单的用户登录：

<?php
session_start();

if (isset($_POST['username'])) {
    $_SESSION['username'] = $_POST['username'];
    echo "Logged in as: " . $_SESSION['username'];
}
?>
<form method="post">
    Username: <input type="text" name="username">
    <input type="submit" value="Login">
</form>

发送邮件

使用PHP发送简单邮件：

<?php
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email from PHP.";
$headers = "From: sender@example.com";

if (mail($to, $subject, $message, $headers)) {
    echo "Email sent successfully.";
} else {
    echo "Email sending failed.";
}
?>

这些示例展示了PHP的基本功能实现，可以根据具体需求进行扩展和修改。

php实现简单的