100行php代码

<?php
// 基本变量声明
$name = "World";
$greeting = "Hello, ";

// 条件语句
if ($name == "World") {
    echo $greeting . $name . "!\n";
} else {
    echo "Unknown name.\n";
}

// 循环
for ($i = 0; $i < 10; $i++) {
    echo "Iteration: " . $i . "\n";
}

// 函数定义
function sayHello($name) {
    return "Hello, " . $name . "!";
}

echo sayHello("PHP");

// 数组操作
$fruits = array("Apple", "Banana", "Cherry");
foreach ($fruits as $fruit) {
    echo $fruit . "\n";
}

// 字符串操作
$str = "Hello World!";
echo strlen($str) . "\n"; // 输出字符串长度

// 数学运算
echo pow(2, 3) . "\n"; // 输出2的3次方

// 获取当前时间
echo date("Y-m-d H:i:s") . "\n";

// 文件操作
$file = fopen("example.txt", "r");
if ($file) {
    while (($line = fgets($file)) !== false) {
        echo $line;
    }
    fclose($file);
}

// 数据库连接（示例）
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

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

$sql = "SELECT id, firstname, lastname FROM MyGuests";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    while($row = $result->fetch_assoc()) {
        echo "id: " . $row["id"]. " - Name: " . $row["firstname"]. " " . $row["lastname"]. "\n";
    }
} else {
    echo "0 results";
}
$conn->close();

// 更多的PHP代码可以继续添加...
?>