PHP文件处理教程：实现高级功能的读取和写入操作

$handle = fopen("data.txt", "r");
if ($handle) {
    while (($line = fgets($handle)) !== false) {
        echo $line;
    }
    fclose($handle);
} else {
    echo "文件打开失败！";
}

$content = file_get_contents("data.txt");
echo $content;

if (($handle = fopen("data.csv", "r")) !== false) {
    while (($data = fgetcsv($handle)) !== false) {
        // 对每行数据进行处理
        print_r($data);
    }
    fclose($handle);
} else {
    echo "CSV文件打开失败！";
}

$handle = fopen("output.txt", "w");
if ($handle) {
    fwrite($handle, "Hello, World!");
    fclose($handle);
    echo "文本内容写入成功！";
} else {
    echo "文件打开失败！";
}

$data = array(
    array("Name", "Age", "Email"),
    array("John", 25, "john@example.com"),
    array("Jane", 30, "jane@example.com")
);

$handle = fopen("output.csv", "w");
if ($handle) {
    foreach ($data as $row) {
        fputcsv($handle, $row);
    }
    fclose($handle);
    echo "CSV文件写入成功！";
} else {
    echo "文件打开失败！";
}