請求頭信息 · slim4文檔翻譯

# 請求頭 Every HTTP request has headers. These are metadata that describe the HTTP request but are not visible in the request’s body. Slim’s PSR-7 Request object provides several methods to inspect its headers. > 每個HTTP請求都有標頭。這些元數據描述了HTTP請求，但在請求體中不可見。Slim的PSR-7請求對象提供了幾個方法來檢查它的頭文件。 ## 獲取所有請求頭 getHeaders You can fetch all HTTP request headers as an associative array with the PSR-7 Request object’s`getHeaders()`method. The resultant associative array’s keys are the header names and its values are themselves a numeric array of string values for their respective header name. > 您可以通過PSR-7請求對象的`getHeaders()`方法獲取所有HTTP請求頭信息。由此產生的關聯數組的鍵是標題名，其值本身是各自標題名的字符串值的數字數組。 ~~~php $headers = $request->getHeaders(); foreach ($headers as $name => $values) { echo $name . ": " . implode(", ", $values); } ~~~ Figure 5: Fetch and iterate all HTTP request headers as an associative array. ## 獲取一個請求頭 getHeaderLine You can get a single header’s value(s) with the PSR-7 Request object’s`getHeader($name)`method. This returns an array of values for the given header name. Remember,*a single HTTP header may have more than one value!* > 您可以使用PSR-7請求對象的`getHeader($name)`方法獲得單個頭文件的值。這將返回給定標題名稱的值數組。記住，*一個HTTP報頭可能有多個值!* ~~~php $headerValueArray = $request->getHeader('Accept'); ~~~ Figure 6: Get values for a specific HTTP header. You may also fetch a comma-separated string with all values for a given header with the PSR-7 Request object’s`getHeaderLine($name)`method. Unlike the`getHeader($name)`method, this method returns a comma-separated string. > 您還可以使用PSR-7請求對象的`getHeaderLine($name)`方法獲取一個以逗號分隔的字符串，其中包含給定標題的所有值。與`getHeader($name)`方法不同，該方法返回一個逗號分隔的字符串。 ~~~php $headerValueString = $request->getHeaderLine('Accept'); ~~~ Figure 7: Get single header's values as comma-separated string. ## Detect Header 檢測請求頭 hasHeader You can test for the presence of a header with the PSR-7 Request object’s`hasHeader($name)`method. > 您可以使用PSR-7請求對象的`hasHeader($name)`方法測試報頭是否存在。 ~~~php if ($request->hasHeader('Accept')) { // Do something } ~~~ Figure 8: Detect presence of a specific HTTP request header.