代码高亮

<?php
// 纯 PHP 演示代码 - 无 HTML，直接输出结果

// 1. 定义变量
$name = "PHP 演示程序";
$version = "8.0+";
$currentYear = date("Y");

// 2. 输出基础信息
echo "===== {$name} =====\n";
echo "运行版本：{$version}\n";
echo "当前年份：{$currentYear}\n\n";

// 3. 数组演示
$languages = ["PHP", "Java", "Python", "JavaScript", "Go"];
echo "编程语言列表：\n";
// 4. 循环遍历数组
foreach ($languages as $index => $lang) {
    echo ($index + 1) . ". " . $lang . "\n";
}

echo "\n";

// 5. 函数演示：计算两数之和
function add($a, $b) {
    return $a + $b;
}

$num1 = 10;
$num2 = 25;
$result = add($num1, $num2);
echo "函数计算：{$num1} + {$num2} = {$result}\n\n";

// 6. 条件判断演示
$score = 85;
echo "成绩评定：";
if ($score >= 90) {
    echo "优秀";
} elseif ($score >= 60) {
    echo "及格";
} else {
    echo "不及格";
}

echo "\n\n";

// 7. 系统信息演示
echo "服务器信息：\n";
echo "运行系统：" . PHP_OS . "\n";
echo "PHP 路径：" . PHP_BINARY . "\n";

echo "\n===== 演示结束 =====";
?>