php4的session技巧评述（二）

";  
    $matchStart = strpos($data, $matchStr);  
    if ($matchStart == 0) {  
        if (strlen($data) < strlen($matchStr)) return "";  
        $tmpStr = substr($data, 0, strlen($matchStr));  
        if (strcmp($tmpStr, $matchStr) != 0) return "";  
    }  
  
    $typeStart = $matchStart + strlen($matchStr);  
    $dataType = substr($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

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