我知道不应该echo
在控制器中使用,但我不明白我应该使用什么来返回 xml 以便下载它。请注意,它不是服务器上的文件,它只是一个字符串:
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 $xml;
}
它实际上按预期工作:浏览器下载具有给定文件名的文件,其内容是$xml
值。
但是在文件的末尾有关于标题的警告:
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]
据我所知,这是由于使用了echo
in 控制器。可能会发生在发送标头之前有一个输出,然后是警告。
替换echo
函数的正确方法是什么?
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());
}
关于评论
在这个问题php-exit-or-return-which-is-better , what-are-the-differences-in-die-and-exit-in-php 中已经详细解释了使用return , exit或die
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我来说两句