我試圖了解如何為強(qiáng)制下載創(chuàng)建響應(yīng)以及瀏覽器如何處理它。在此處關(guān)注本文：教程。我有一個發(fā)送文件作為下載響應(yīng)的腳本。<?php// it's a zip fileheader('Content-Type: application/zip');// 1 million bytes (about 1megabyte)header('Content-Length: 1000000');// load a download dialogue, and save it as download.zipheader('Content-Disposition: attachment; filename="download.zip"');// 1000 times 1000 bytes of datafor ($i = 0; $i < 1000; $i++) { echo str_repeat(".",1000); // sleep to slow down the download // sleep(5);}sleep(5);當(dāng)sleep()函數(shù)在循環(huán)內(nèi)時，它會在文件開始下載之前等待一段時間。但是當(dāng)放在循環(huán)之外時，文件會立即開始下載。誰能幫我理解這種行為？
1 回答
揚(yáng)帆大魚
TA貢獻(xiàn)1799條經(jīng)驗(yàn) 獲得超9個贊
第二種情況的問題是在調(diào)用睡眠函數(shù)之前將文件發(fā)送給客戶端。您可以將輸出存儲在內(nèi)部緩沖區(qū)中，并在睡眠功能之后發(fā)送。（我不建議將其用于生產(chǎn)。）試試這個修改后的程序：
<?php
// it's a zip file
header('Content-Type: application/zip');
// 1 million bytes (about 1megabyte)
header('Content-Length: 1000000');
// load a download dialogue, and save it as download.zip
header('Content-Disposition: attachment; filename="download.zip"');
//Turn on output buffering
ob_start();
// 1000 times 1000 bytes of data
for ($i = 0; $i < 1000; $i++) {
echo str_repeat(".",1000);
// sleep to slow down the download
// sleep(5);
}
//Store the contents of the output buffer
$buffer = ob_get_contents();
// Clean the output buffer and turn off output buffering
ob_end_clean();
sleep(5);
echo $buffer;
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