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比较模糊的是session_decode和session_encode：
bool session_decode(string data);
session_decode() decodes the session data in data, setting variables
st......
$dataType = substr($data, $typeStart, 1);
if (strcmp($dataType, "s") == 0) { /* string */
$lenStart = $typeStart 2;
$lenEnd = strpos($data, ":", $lenStart) - 1;
$lenLen = $lenEnd - $lenStart 1;
$strLen = substr($data, $lenStart, $lenLen);
$strStart = $lenEnd 3;
$strResult = substr($data, $strStart, $strLen);
return $strResult;
} else if (strcmp($dataType, "i") == 0 ||
strcmp($dataType, "d") == 0) { /* number */
$numStart = $typeStart 2;
$numEnd = strpos($data, ";", $numStart) - 1;
$numLen = numEnd - numStart 1;
$numResult = substr($data, $numStart, $numLen);
return $numResult;
} else {
return "";
}
}
?>
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