十天学会php之第七天
[b][color=#ff6600] [/color][/b]5Rti$R,\ QK5I%j n[color=#000000][font=宋体][size=10.5pt]学习目的：学会[/size][/font]SESSION[font=宋体][size=10.5pt]的使用[/size][/font][/color]
[color=#000000]SESSION[/color][color=#000000][font=宋体][size=10.5pt]的作用很多，最多用的就是站点内页面间变量传递。在页面开始我们要[/size][/font]session_start();[font=宋体][size=10.5pt]开启[/size][/font]SESSION[font=宋体][size=10.5pt]；[/size][/font][/color]
[color=#000000][font=宋体][size=10.5pt]然后就可以使用[/size][/font]SESSION[font=宋体][size=10.5pt]变量了，比如说要赋值就是：[/size][/font]$_SESSION['item']="item1";[font=宋体][size=10.5pt]要得到值就是[/size][/font]$item1=$_SESSION['item'];[font=宋体][size=10.5pt]，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[/size][/font]SESSION[font=宋体][size=10.5pt]变量为空，可以这么写：[/size][/font]empty($_SESSION['inum'])[font=宋体][size=10.5pt]返回[/size][/font]true or false[font=宋体][size=10.5pt]。[/size][/font][/color]
[font=宋体][size=10.5pt][color=#000000]下面综合一下前面所说的我们来看一个登陆程序，判断用户名密码是否正确。[/color][/size][/font]
[font=宋体][size=10.5pt][color=#000000]登陆表单是这样：[/color][/size][/font][color=#000000]login.php
<table width="100%" height="100%" border="0" align="center" cellpadding="0" cellspacing="0"> k-C9_ vG%f$P(X5]/|
<tr>
<form action="checklogin.php" method="post"><td align="center" valign="middle"><table width="400" border="0" cellpadding="5" cellspacing="1" class="tablebg">n8H%e)X$g m(FH }T
<tr class="tdbg">9pJ7c2k [:w9d!x
<td colspan="2"><div align="center">Administrators Login</div></td>
</tr>
<tr class="tdbg">
<td><div align="center">Username</div></td>em ~;^ N"P6D
<td><div align="center">n$QV$C$n}8\
<input name="username" type="text" id="username">9a KT%Vj Pz-} k
</div></td>
</tr>
<tr class="tdbg">H ].ut9y]r ]
<td><div align="center">Password</div></td>BX%_(y;C
<td><div align="center">
<input name="password" type="password" id="password">
</div></td>
</tr>O$fdh+_\i8@ \d
<tr class="tdbg">
<td colspan="2"><div align="center">
<input type="submit" name="Submit" value="Submit">
<input type="reset" name="Submit2" value="Clear">E8[1b y(Om
</div></td>N F ])k&u%x5XJp4t Q#J
</tr>Rr/[7d7]+? j
</table></td></form>/NO W5Us*`:L
</tr>czG)x*}Q#O7K
</table>
[font=宋体][size=10.5pt]处理文件是这样[/size][/font][/color]
[color=#000000]<?
require_once('conn.php');
session_start();pb+J2Z Ba]
$username=$_POST['username'];
$password=$_POST['password'];
$exec="select * from admin where username='".$username."'";
if($result=mysql_query($exec))
{
if($rs=mysql_fetch_object($result))
{ K6N!v-g gG'cb }
if($rs->password==$password)
{'w~)prD
$_SESSION['adminname']=$username;
header("location:index.php");
}!}l/orF,N P5a2J
else
{;`4`"Gft9n
echo "<script>alert('Password Check Error!');location.href='login.php';</script>";7X'T@;@ ?5V%v%kl@
} ]:Sj y#jo*uG
}*B"B0\I Idr
else1o }/MP@ JL{#r"x
{+`8X&R+w FWI
echo "<script>alert('Username Check Error!');location.href='login.php';</script>";
}-n(G F t%U~
}
else
{X:XCs'G0|#e+I
echo "<script>alert('Database Connection Error!');location.href='login.php';</script>";"I1nz R k
}
f x|;k ?;?B l hd
?>Le;x:r~+p
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conn.php[/color][font=宋体][size=10.5pt][color=#000000]是这样：[/color][/size][/font]
[color=#000000]<?2{ P*HK*G
$conn=mysql_connect ("127.0.0.1", "", "");Xt${c v z ]o.Mv
mysql_select_db("shop"); V hI Pg9BC
?> +]"~S hc_ bS!H5GH?/x
[/color][color=#000000][font=宋体][size=10.5pt]由于[/size][/font] $_SESSION['adminname']=$username;[font=宋体][size=10.5pt]我们可以这样写验证是否登陆语句的文件：[/size][/font][/color][color=#000000]checkadmin.asp
<?
session_start();
if($_SESSION['adminname']=='')2|I f e+WX3Y m5K ^
{
echo "<script>alert('Please Login First');location.href='login.php';</script>";
}-g k g5A%^ s A k&D
?> fuo2f7? W.{
[font=宋体][size=10.5pt]十天学会[/size][/font]php[font=宋体][size=10.5pt]之第七天就说到这里，第八天说一下怎么弄一个分页。[/size][/font][/color]
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