学习目的:学会SESSION的使用 /(hTk&
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SESSION的作用很多,最多用的就是站点内页面间变量传递。在页面开始我们要session_start();开启SESSION; 2sk7E'2(
然后就可以使用SESSION变量了,比如说要赋值就是:$_SESSION['item']="item1";要得到值就是$item1=$_SESSION['item'];,很简单吧。这里我们可能会使用到一些函数,比如说判断是不是某SESSION变量为空,可以这么写:empty($_SESSION['inum'])返回true or false。 ,h'Q
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下面综合一下前面所说的我们来看一个登陆程序,判断用户名密码是否正确。 GPhhg
登陆表单是这样:login.php l7^^MnkC
<table width="100%" height="100%" border="0" align="center" cellpadding="0" cellspacing="0"> B;e<.M)e
<tr> KRT&]2
<form action="checklogin.php" method="post"><td align="center" valign="middle"><table width="400" border="0" cellpadding="5" cellspacing="1" class="tablebg"> fd>{UyU
<tr class="tdbg"> -k8sR1(
<td colspan="2"><div align="center">Administrators Login</div></td> GF%/q :9
</tr> uK"FopUJ4i
<tr class="tdbg"> 'F.P93
<td><div align="center">Username</div></td> W4 d32+V
<td><div align="center"> Ti_G
<input name="username" type="text" id="username"> tm=,x~
</div></td> 6?<lS.s
</tr> (Q%
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<tr class="tdbg"> h`N2M,
<td><div align="center">Password</div></td> xi "3NF%=
<td><div align="center"> z|%Pi J,
<input name="password" type="password" id="password"> X5[t6q!
</div></td> {x,)OgK!{
</tr> 3Q=\W<Wu
<tr class="tdbg"> np6G~0Y`
<td colspan="2"><div align="center"> 2v4K3O60G
<input type="submit" name="Submit" value="Submit"> } f&=}
<input type="reset" name="Submit2" value="Clear"> Zf!Q4a"
</div></td> ,;w~ VZ4
</tr> klFS3G
</table></td></form> sV{\IgH/x
</tr> "D_:`@V(
</table> 59l9_yFJ
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处理文件是这样 X coPkW
<? a<r,LE
require_once('conn.php'); 'ZMh<M[
session_start(); {._'Q[
$username=$_POST['username']; _%D7D~2r|
$password=$_POST['password']; e8xq`:4Y
$exec="select * from admin where username='".$username."'"; <%uEWb)
if($result=mysql_query($exec)) )/)u.$pi
{ aaY AS"/:
if($rs=mysql_fetch_object($result)) r.#r!.6 q
{ %?gG-R
if($rs->password==$password) ,v8e7T
{ +39uKOrZ
$_SESSION['adminname']=$username; 8o%Vn'^t
header("location:index.php"); "ufSHrZv
} /}U)|6-B
else L k
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{ =&UE67eK,
echo "<script>alert('Password Check Error!');location.href='login.php';</script>"; W9w(a:~hY
} e3CFW_p
} `&q+ f+z
else ,(x`zpp _
{ )Wq1af
echo "<script>alert('Username Check Error!');location.href='login.php';</script>"; yVK
;
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} v {HF}L
} CS~onf<xz
else =Vs?=|r
{ PA,aYg0f
echo "<script>alert('Database Connection Error!');location.href='login.php';</script>"; m-Jy
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} +yfUB8Xw
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?> Y(7&3+'K
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conn.php是这样: v%*don
<? ]`x+wWe
$conn=mysql_connect ("127.0.0.1", "", ""); q`2dL)E
mysql_select_db("shop"); ">wvd*w0"(
?> 3<$Ek3X
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由于 $_SESSION['adminname']=$username;我们可以这样写验证是否登陆语句的文件:checkadmin.asp w@,p`
<? vPYHM2
session_start(); %4!^AA%
if($_SESSION['adminname']==') #*CMf.OCh
{ ]aF;
echo "<script>alert('Please Login First');location.href='login.php';</script>"; &&C70+_po
} G^dp9A
?> d9TTAaf
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呵呵,今天说到这里,明天说一下怎么弄一个分页。