Created
March 29, 2012 15:01
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PHPから画像を送信する際にキャッシュを有効にしておく ref: http://qiita.com/items/938139ba8f20a71f8915
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<?php | |
$file_name = some_function(); | |
//画像タイプ判別 | |
$type_id = exif_imagetype($file_name); | |
$type_name = image_type_to_mime_type($type_id); | |
//var_dump($type_name); | |
//最終更新日を作成(キャッシュ用) | |
$last_modified = filectime($file_name); | |
///もしキャッシュ更新確認リクエストなら | |
if(isset($_SERVER["HTTP_IF_MODIFIED_SINCE"])){ | |
$str_time = $_SERVER["HTTP_IF_MODIFIED_SINCE"]; | |
$last_modified_since = strtotime($str_time); | |
if($last_modified_since == $last_modified){ | |
//ファイル更新がなければ、キャッシュ有効を返す。 | |
header("HTTP/1.1 304 image not modified"); | |
header('Pragma: cache'); | |
header("Cache-Control: max-age=".(60*60*24*100)); // 100日キャッシュしていい | |
exit; | |
} | |
} | |
//画像を返す。 | |
header("Last-Modified: " . date('r', $last_modified)); | |
header("Content-type: " . $type_name); | |
//キャッシュを有効にする | |
header('Pragma: cache'); | |
header("Cache-Control: max-age=".(60*60*24*100)); // 100日キャッシュしていい | |
echo file_get_contents($file_name); |
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