[PHP] file_get_contents: failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found

之前寫了一個小程式用 file_get_contents 去爬別人家網站的資料，但最近突然無法使用，噴出錯誤訊息：

Warning: file_get_contents(<url>): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found in <Your Program> on line <Error Line>

經查詢是因為沒有指定 user-agent，這樣一來就沒辦法簡單用 file_get_contents 去撈資料，只好改成 curl，程式碼分別如下：

原來的程式碼：

$contents = file_get_contents($url);

改版後的程式碼：

$curl_handle = curl_init();
curl_setopt($curl_handle, CURLOPT_URL, $url);
curl_setopt($curl_handle, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl_handle, CURLOPT_USERAGENT, 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36');
curl_setopt($curl_handle, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($curl_handle, CURLOPT_SSL_VERIFYPEER, false);
$contents = curl_exec($curl_handle);
curl_close($curl_handle);