PHP printf在構建API響應中的應用

printf 是一個用于格式化字符串的 PHP 語言函數

1. 輸出 JSON 數據：

<?php
$data = array(
    "name" => "John Doe",
    "age" => 30,
    "city" => "New York"
);

header('Content-Type: application/json');
echo printf(json_encode($data, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
?>

2. 輸出 XML 數據：

<?php
$data = array(
    "user" => array(
        "id" => 1,
        "name" => "John Doe",
        "email" => "john.doe@example.com"
    )
);

header('Content-Type: application/xml');
echo printf(xml_encode($data, XML_PRETTY_PRINT | XML_USE_CDATA));
?>

3. 輸出 CSV 數據：

<?php
$data = array(
    array("Name", "Age", "City"),
    array("John Doe", 30, "New York"),
    array("Jane Smith", 28, "Los Angeles")
);

header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename="data.csv"');

$fp = fopen('php://output', 'w');
foreach ($data as $row) {
    fputcsv($fp, $row);
}
fclose($fp);
?>

4. 輸出自定義格式的數據：

<?php
$data = array(
    "name" => "John Doe",
    "age" => 30,
    "city" => "New York",
    "is_student" => false,
    "courses" => array("PHP", "MySQL", "JavaScript")
);

header('Content-Type: text/plain');
echo printf("%s is %d years old and lives in %s. %s is a student. He is studying the following courses: %s.\n",
    $data["name"],
    $data["age"],
    $data["city"],
    $data["is_student"] ? "Yes" : "No",
    implode(", ", $data["courses"])
);
?>

在構建 API 響應時，使用 printf 可以幫助你快速生成格式化的字符串，從而提高開發效率。同時，通過設置正確的 Content-Type 頭，你可以確保客戶端能夠正確解析響應數據。