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<?php
$link=mysql_connect("localhost:3306","root","123");
mysql_select_db("php");
$str="select * from t_user where username='"$_POST["username"]"' and password='"$_POST["password"]"'";
$query=mysql_query($str);
$rows=mysql_num_rows($query);
if($rows)
{
echo"fds";
}
else
{
echo"ab";
}
?>
$str="select * from t_user where username='".$_POST["username"]."' and password='".$_POST["password"]."'";
<?php
$link=mysql_connect("localhost:3306","root","123");
mysql_select_db("php",$link);
$str="select * from t_user where username='"$_POST["username"]"' and password='"$_POST["password"]"'";
$query=mysql_query($str);
$rows=mysql_num_rows($query);
if($rows)
{
echo"fds";
}
else
{
echo"ab";
}
?>