我知道不應該echo在控制器中使用，但我不明白我應該使用什么來返回 xml 以便下載它。請注意，它不是服務器上的文件，它只是一個字符串：public function export(){ $this->autoRender = false; $id = $this->request->getQuery('id'); $invoice = $this->Invoices->get($id, ['contain' => ['Customers', 'ItemInvoices' => ['ItemProformas' => ['ItemDeliveryNotes' => ['ItemOrders' => ['Orders' => ['Customers']]]]]]]); $fpr = new ExportInvoice(); $fpr->SetInvoice($invoice); header('Content-type: text/xml'); header('Content-Disposition: attachment; filename="' . $fpr->getFilename() . '"'); $xml = $fpr->asXML(); echo $xml;}它實際上按預期工作：瀏覽器下載具有給定文件名的文件，其內容是$xml值。但在文件末尾有關于標題的警告：Warning (512): Unable to emit headers. Headers sent in file=/home/mark/myproject/src/Controller/InvoicesController.php line=130 [CORE/src/Http/ResponseEmitter.php, line 51]Warning (2): Cannot modify header information - headers already sent by (output started at /home/mark/myproject/src/Controller/InvoicesController.php:130) [CORE/src/Http/ResponseEmitter.php, line 152]Warning (2): Cannot modify header information - headers already sent by (output started at /home/mark/myproject/src/Controller/InvoicesController.php:130) [CORE/src/Http/ResponseEmitter.php, line 181]Warning (2): Cannot modify header information - headers already sent by (output started at /home/mark/myproject/src/Controller/InvoicesController.php:130) [CORE/src/Http/ResponseEmitter.php, line 181]據我所知，這是由于使用了echoin 控制器。在發送標頭之前可能會發生輸出，然后是警告。替換功能的正確方法是echo什么？
2 回答
嗶嗶one
TA貢獻1854條經驗 獲得超8個贊
在文檔之前，您可以使用該框架，查看如何將字符串作為文件發送
public function export()
{
$this->autoRender = false;
$id = $this->request->getQuery('id');
$invoice = $this->Invoices->get($id, ['contain' => ['Customers', 'ItemInvoices' => ['ItemProformas' => ['ItemDeliveryNotes' => ['ItemOrders' => ['Orders' => ['Customers']]]]]]]);
$fpr = new ExportInvoice();
$fpr->SetInvoice($invoice);
// header('Content-type: text/xml');
// header('Content-Disposition: attachment; filename="' . $fpr->getFilename() . '"');
$xml = $fpr->asXML();
$response = $this->response;
$response = $response->withStringBody($xml);
// use $response->body($xml); for versions before 3.4.0
$response = $response->withType('xml');
$response = $response->withDownload($fpr->getFilename());
return $response;
}
Smart貓小萌
TA貢獻1911條經驗 獲得超7個贊
只需使用die()或exit()
public function export()
{
$this->autoRender = false;
$id = $this->request->getQuery('id');
$invoice = $this->Invoices->get($id, ['contain' => ['Customers', 'ItemInvoices' => ['ItemProformas' => ['ItemDeliveryNotes' => ['ItemOrders' => ['Orders' => ['Customers']]]]]]]);
$fpr = new ExportInvoice();
$fpr->SetInvoice($invoice);
if (!headers_sent())
{
header('Content-type: text/xml');
header('Content-Disposition: attachment; filename="' . $fpr->getFilename() . '"');
}
else
{
//Do something else to let them know they can't expect a file
die();
}
die($fpr->asXML());
}
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