我一直关注缓存功能this tutorial。我遇到了为cache_page()
传递回调函数ob_start
的问题。如何将cache_page()
以及两个参数$mid
和$path
传递给ob_start
,这与
ob_start("cache_page($mid,$path)");
当然以上都行不通。这是示例代码:
$mid = $_GET['mid'];
$path = "cacheFile";
define('CACHE_TIME', 12);
function cache_file($p,$m)
{
return "directory/{$p}/{$m}.html";
}
function cache_display($p,$m)
{
$file = cache_file($p,$m);
// check that cache file exists and is not too old
if(!file_exists($file)) return;
if(filemtime($file) < time() - CACHE_TIME * 3600) return;
header('Content-Encoding: gzip');
// if so, display cache file and stop processing
echo gzuncompress(file_get_contents($file));
exit;
}
// write to cache file
function cache_page($content,$p,$m)
{
if(false !== ($f = @fopen(cache_file($p,$m), 'w'))) {
fwrite($f, gzcompress($content));
fclose($f);
}
return $content;
}
cache_display($path,$mid);
ob_start("cache_page"); ///// here's the problem
答案 0 :(得分:5)
signature of the callback to ob_start
has to be:
from django import forms
Class EmailForm(forms.Form):
email = forms.EmailField(required=True, max_length=1000)
您的string handler ( string $buffer [, int $phase ] )
方法具有不兼容的签名:
cache_page
这意味着您期望不同的参数(cache_page($content, $p, $m)
和$p
)而不是$m
将传递给回调。无法使ob_start
更改此行为。它不会发送ob_start
和$p
。
在链接教程中,缓存文件名是从请求派生的,例如
$m
从您的代码我想要手动定义文件路径。你可以做的是:
function cache_file()
{
return CACHE_PATH . md5($_SERVER['REQUEST_URI']);
}
这会将兼容的回调传递给$p = 'cache';
$m = 'foo';
ob_start(function($buffer) use ($p, $m) {
return cache_page($buffer, $p, $m);
});
,它会将带有输出缓冲区的ob_start
函数和closes over $p
and $m
调用到回调中。