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    function checkFileType($fileName){
        $file     = fopen($fileName, "rb");
        $bin      = fread($file, 2); //Ö»¶Á2×Ö½Ú
        fclose($file);
        $strInfo  = @unpack("C2chars", $bin);// CΪÎÞ·ûºÅÕûÊý£¬ÍøÉÏËѵ½µÄ¶¼ÊÇc£¬ÎªÓзûºÅÕûÊý£¬ÕâÑù»á²úÉú¸ºÊýÅжϲ»Õý³£
        $typeCode = intval($strInfo['chars1'].$strInfo['chars2']);
        $fileType = '';
        if($typeCode == 255216 /*jpg*/ || $typeCode == 7173 /*gif*/ || $typeCode == 13780 /*png*/) {
            return true;
        }else{
            return false;
        }
    }


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function genPassword($min = 5, $max = 8)
{
$validchars="abcdefghijklmnopqrstuvwxyz123456789";
$max_char=strlen($validchars)-1;
$length=mt_rand($min,$max);
$password = "";
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{
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