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供大家参考
<?php
error_reporting(0);
header("content_type:text/html;charset=gbk");
$conn=mysql_connect("localhost","root","") or die("链接错误");
mysql_select_db("phptest",$conn);
// echo "链接成功"."<br>";
$username=$_POST['username'];
$password=$_POST['password'];
// echo "用户输入的是:"."$username"."<br>"."$password";
$sqla="select * from user";
$sqlb="select * from user where username='$username'";
$sqlc="select * from user where username='$username' and password='$password'";
$resulta=mysql_query($sqla,$conn);
$resultb=mysql_query($sqlb,$conn);
$resultc=mysql_query($sqlc,$conn);
$numa=mysql_num_rows($resulta);
$numb=mysql_num_rows($resultb);
$numac=mysql_num_rows($resultc);
if($username=="" or $password==""){
echo "用户名或密码不能为空";
}else if($numb>0 ){
while($all=mysql_num_rows($result)){
echo "$all[username]"." "."$all[password]"."<br>";
}
}
?>
<html>
<body>
<form action="newTest.php" method="post">
<ul>
<li>username:<input type="text" name="username"/></li>
<li>password:<input type="text" name="password"/></li>
<li><input type="submit" name="sub"value="sub"/></li>
</ul>
</form>
</body>
</html>
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