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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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php ÖÐ$_SESSIONµÄÀí½â

       PHPÓкܶàÖµµÃѧϰµÄµØ·½£¬ÕâÀïÎÒÃÇÖ÷Òª½éÉÜPHP SessionʹÓá£ÔÚPHP¿ª·¢ÖÐ¶Ô±ÈÆðCookie£¬session ÊÇ´æ´¢ÔÚ·þÎñÆ÷¶ËµÄ»á»°£¬Ïà¶Ô°²È«£¬²¢ÇÒ²»Ïñ Cookie ÄÇÑùÓд洢³¤¶ÈÏÞÖÆ£¬ÏÂÃæÎÒÃǾͼòµ¥½éÉÜ PHP SessionʹÓá£
 
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php date()º¯Êý˵Ã÷

string date ( string format [, int timestamp] )     //ÆäÖÐtimestampΪ¿ÉÑ¡£¬Ä¬ÈÏֵΪtime();
date("1");    //Monday
date("m.d.y");   //12.21.09
date("m.d.Y");//12.21.2009
$tomorrow  = mktime(0, 0, 0, date("m")  , date("d")+1, date("Y"));
$las ......

PHPËæ»úÃÜÂëµÄÉú³É

<?php
function genPassword($min = 5, $max = 8)
{
$validchars="abcdefghijklmnopqrstuvwxyz123456789";
$max_char=strlen($validchars)-1;
$length=mt_rand($min,$max);
$password = "";
for($i=0;$i<$length;$i++)
{
$password.=$validchars[mt_rand(0,$max_char)] ......

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$abc='I love u';
echo $abc          //½á¹ûÊÇ:I love u
echo '$abc'        //½á¹ûÊ ......

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   header("Content-type:application/vnd.ms-excel");
   header("Content-Disposition:finlename=php.xls");
    vnd.ms-excel -----¶¨ÒåÊä³öÎļþ¸ñ
    php.xls  ---------¶¨ÒåÊä³öµÄÎļþÃû
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