十天学会php之第七天
[b][color=#ff6600] [/color][/b][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]
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[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] sq ?MH:B9F g
[font=宋体][size=10.5pt][color=#000000]登陆表单是这样：[/color][/size][/font][color=#000000]login.php0j,Rq O.bq{}
<table width="100%" height="100%" border="0" align="center" cellpadding="0" cellspacing="0">
<tr>uu,Vp*\o Bd\
<form action="checklogin.php" method="post"><td align="center" valign="middle"><table width="400" border="0" cellpadding="5" cellspacing="1" class="tablebg">
<tr class="tdbg">
<td colspan="2"><div align="center">Administrators Login</div></td>h^K9b0_DK
</tr>%G IB}Il
<tr class="tdbg">
<td><div align="center">Username</div></td>_n b1c2e
<td><div align="center">C D;s7L zF0I x
<input name="username" type="text" id="username">*H[,D#G8u6p&fkvA#w
</div></td>#H?~,qqT*S
</tr>
<tr class="tdbg">qAy \a"j+il
<td><div align="center">Password</div></td>
<td><div align="center">
<input name="password" type="password" id="password">
</div></td>
</tr>
<tr class="tdbg">
<td colspan="2"><div align="center">B OIx?,y8i?*Nw+m
<input type="submit" name="Submit" value="Submit"> T b!O mN'@4~
<input type="reset" name="Submit2" value="Clear">
</div></td>A"WVk7d#l/Af
</tr>D3bY} [{
</table></td></form>(G+g*~5P'az
</tr> qA!i5uGxJ
</table>
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[font=宋体][size=10.5pt]处理文件是这样[/size][/font][/color]
[color=#000000]<?
require_once('conn.php');1_.H0bM-O
session_start();
$username=$_POST['username']; ^|#i$H3d(}
$password=$_POST['password'];
$exec="select * from admin where username='".$username."'";G3v,hiA0]
if($result=mysql_query($exec))/tf ln@1g$C6OO3L&l
{)K7g)Wr+G,Q$[
if($rs=mysql_fetch_object($result))
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if($rs->password==$password)j(uiMs3}
{ _-t.BR4x _ zo:A
$_SESSION['adminname']=$username; TF[:]'XVyIF
header("location:index.php");5w b4Sn1n
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else
{ e?aq_
echo "<script>alert('Password Check Error!');location.href='login.php';</script>"; U zY])k1@
}
}
else$[sl-G3f ?3[1O
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echo "<script>alert('Username Check Error!');location.href='login.php';</script>";
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}
else
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echo "<script>alert('Database Connection Error!');location.href='login.php';</script>";,uA0f8Sio I
}e } U7d5_%wB$S^6_U/L
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?> Jj M` R,A"m
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conn.php[/color][font=宋体][size=10.5pt][color=#000000]是这样：[/color][/size][/font]
[color=#000000]<?
$conn=mysql_connect ("127.0.0.1", "", ""); J xz0Z2a5T
mysql_select_db("shop");
?>
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[/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
<?T)Fyh"H-[)K
session_start();~(Y Q:]/SW {1~W5\ Ato
if($_SESSION['adminname']=='')/bMv4N A6M l$yw5u"g[
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echo "<script>alert('Please Login First');location.href='login.php';</script>";(_4l1u Z8Z!scm
}
?>
[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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