php - fopen 有大小限制吗？

Question

我在 php 中使用 fopen 时遇到问题。

如果我手动打开所需的 URL，我会得到：

OK,13:24:34.236 INFO [10] org.mortbay.http.SocketListener - Started SocketListener on 0.0.0.0:4443 13:24:34.236 INFO [10] org.mortbay.util.Container - Started org.mortbay.jetty.Server@52fe85 13:24:39.251 INFO [11] org.mortbay.util.Credential - Checking Resource aliases 13:24:39.251 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: getNewBrowserSession[*firefox, http://dev.REPLACED.com] on session null 13:24:39.251 INFO [11] org.openqa.selenium.server.BrowserSessionFactory - creating new remote session 13:24:39.939 INFO [11] org.openqa.selenium.server.BrowserSessionFactory - Allocated session 179f69cb121941e3b45c7312664de890 for http://dev.REPLACED.com, launching... 13:24:40.048 INFO [11] org.openqa.selenium.server.browserlaunchers.FirefoxChromeLauncher - Preparing Firefox profile... 13:24:47.751 INFO [11] org.openqa.selenium.server.browserlaunchers.FirefoxChromeLauncher - Launching Firefox... 13:25:01.751 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK,179f69cb121941e3b45c7312664de890 on session 179f69cb121941e3b45c7312664de890 13:25:01.861 INFO [18] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: windowMaximize[, ] on session 179f69cb121941e3b45c7312664de890 13:25:03.657 INFO [18] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:04.267 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: open[index.php?module=authsystem&func=logout, ] on session 179f69cb121941e3b45c7312664de890 13:25:11.064 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:11.673 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: waitForPageToLoad[30000, ] on session 179f69cb121941e3b45c7312664de890 13:25:11.814 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:12.407 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: type[uname4, Selenium] on session 179f69cb121941e3b45c7312664de890 13:25:12.423 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:13.079 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: type[pass4, casetester] on session 179f69cb121941e3b45c7312664de890 13:25:13.111 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:13.704 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: click[rememberme4, ] on session 179f69cb121941e3b45c7312664de890 13:25:13.782 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:14.361 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: click[//input[@value='Log In'], ] on session 179f69cb121941e3b45c7312664de890 13:25:14.517 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:15.095 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: waitForPageToLoad[30000, ] on session 179f69cb121941e3b45c7312664de890 13:25:16.001 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:16.642 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: click[link=REPLACED, ] on session 179f69cb121941e3b45c7312664de890 13:25:16.751 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:17.345 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: waitForPageToLoad[30000, ] on session 179f69cb121941e3b45c7312664de890 13:25:19.532 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Got result: OK on session 179f69cb121941e3b45c7312664de890 13:25:26.204 INFO [11] org.openqa.selenium.server.SeleniumDriverResourceHandler - Command request: retrieveLastRemoteControlLogs[, ] on session 179f69cb121941e3b45c7312664de890

现在，如果我使用 fopen 打开该网址：

echo fopen($myurl, "r");

显示的内容被切割成 1330 个字符......我是否应该更改限制以使整个内容按预期接收？

Answer 1

首先：

echo fopen($myurl, "r");

显然行不通。我假设你的意思是：

$handle = fopen($myurl, "r");
echo(fread($handle, $some_size));
fclose($handle);

在这种情况下，你做错了。fread() 不能保证在一次调用中返回所有数据；有时您需要多次调用它才能获得整个输入。如果远程 HTTP 服务器使用 Transfer-Encoding: 分块，则尤其如此。

有关更多信息，请参阅fread() 文档。引用文档：

当从任何非常规本地文件读取时，例如读取远程文件或从 popen() 和 fsockopen() 返回的流，读取将在数据包可用后停止。这意味着您应该像下面的示例中所示那样以块的形式收集数据。

$handle = fopen("http://www.example.com/", "rb");
$contents = '';
while (!feof($handle)) {
  $contents .= fread($handle, 8192);
}
fclose($handle);

一个更简单的解决方案是使用 file_get_contents()。但是，此函数将整个文件写入单个字符串，这可能会或可能不会影响性能，具体取决于您对来自网页的输入执行的操作。

Answer 2

尝试将输出缓冲从 ON 更改为设定的大小。例如

output_buffering = 4096