/**
* 在cache中获取键为$key的项的值
* @param string $key 键值
* @return string 如果该项不存在，则返回false
* @access public
*/
public function get($key)
{
$file = $this->cachePath . urlencode($key) . '.cache';
if (file_exists($file)) {
$content = safe_file_get_contents($file);
if ($content === false) {
return false;
}
$tmp = explode('<<%-==-%>>', $content);
$timeout = $tmp[0];
$value = $tmp[1];
if (time() > $timeout) {
$result = false;
} else {
$result = unserialize($value);
}
} else {
$result = false;
}
return $result;
}
function safe_file_get_contents($url, $redirect = 0)
{
$parts = parse_url($url);
$site = $parts['host'];
$port = $parts['port'] ? $parts['port'] : 80;
$path = $parts['path'] . ($parts['query'] ? "?" . $parts['query'] : "") . ($parts['fragment'] ? "#" . $parts['fragment'] : "");
$timeout = 5;
$sock = @fsockopen($site, $port, $errnum, $errstr, $timeout);
if (!$sock) {
return "Cannot connect to {$site}:{$port}: {$errstr}({$errno})";
} else {
@socket_set_timeout($sock, $timeout);
$dump = "GET " . $path . " HTTP/1.0\r\n";
$dump .= "User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT)\r\n";
$dump .= "Host: " . $site . "\r\n";
$dump .= "Connection: close\r\n\r\n";
$res = "";
// Send HTTP query
fputs($sock, $dump);
// Read all
$header = true;
while ($str = fgets($sock, 1024)) {
if ($header) {
if (preg_match("/^Location: ([^\\s]+)\\s*\$/", $str, $m) && ++$redirect < 10) {
return safe_file_get_contents($m[1], $redirect);
}
if ($str == "\r\n") {
$header = false;
}
} else {
$res .= $str;
}
}
fclose($sock);
}
return $res;
}
