您好我在这里有一个代码，它将搜索一个名称然后返回结果分页。我在第19行和第20行出错了
注意：未定义的索引：在第19行的C：\ xampp \ htdocs \ eventreg \ trypaginate2.php中提交 - 现在确定
和
注意：未定义的索引：在第20行的C：\ xampp \ htdocs \ eventreg \ trypaginate2.php中搜索 - 现在确定
但它正在发挥作用。当我转到下一页时，它不会显示任何结果只是一个空白页。
这是我的HTML代码：
<html>
<head>
<title>Title of your search engine</title>
</head>
<body>
<form action='trypaginate2.php' method='POST'>
<center>
<h1>My Search Engine</h1>
<input type='text' size='90' name='search'></br></br>
<input type='submit' name='submit' value='Search source code' ></br></br></br>
</center>
</form>
</body>
</html>
然后php代码在这里：
<?php
if(array_key_exists('search', $_GET))
{
echo "hello";
$search = $_GET['search'];
echo "$search";
}
if(isset($_POST['submit']))
{
if(array_key_exists('search', $_POST))
{
echo "hi";
$search = $_POST['search'];
}
}
if(strlen($search)<=1)
echo "Search term too short";
else
{
echo "You searched for <b>$search</b> <hr size='1'></br>";
include("dbcon.php");
$search_exploded = explode (" ", $search);
$x = "";
$construct = "";
foreach($search_exploded as $search_each)
{
$x++;
if($x==1)
$construct .="name LIKE '%$search_each%'";
else
$construct .="AND name LIKE '%$search_each%'";
}
echo $construct;
$constructs ="SELECT * FROM reginformation WHERE $construct";
$run = mysql_query($constructs);
$foundnum = mysql_num_rows($run);
if ($foundnum==0)
echo "Sorry, there are no matching result for <b>$search</b>.</br></br>1.
Try more general words. for example: If you want to search 'how to create a website'
then use general keyword like 'create' 'website'</br>2. Try different words with similar
meaning</br>3. Please check your spelling";
else
{
echo "$foundnum results found !<p>";
$per_page = 5;
$start = isset($_GET['start']) ? $_GET['start']: '';
$max_pages = ceil($foundnum / $per_page);
if(!$start)
$start=0;
$getquery = mysql_query("SELECT * FROM reginformation WHERE $construct LIMIT $start, $per_page");
/*while($runrows = mysql_fetch_assoc($getquery))
{
$title = $runrows ['regID'];
$desc = $runrows ['name'];
$url = $runrows ['address'];
echo "
<a href='$url'><b>$title</b></a><br>
$desc<br>
<a href='$url'>$url</a><p>
";
}*/
if(mysql_num_rows($getquery)>0)
{
while ($row = mysql_fetch_assoc($getquery)) {
// echo data
echo "<tr onClick =window.location='infodetailsresp.php?id=$row[regID]'><td>$row[name]</td><td>$row[emailadd]</td><td>$row[contactno]</td><td>$row[event]</td><td>$row[date_register]</td></tr><br>";
} // end while
}
else
{
echo ("<SCRIPT LANGUAGE='JavaScript'>
window.alert('No record found.');
window.location.href='reglistresp.php';
</SCRIPT>");
}
//Pagination Starts
echo "<center>";
$prev = $start - $per_page;
$next = $start + $per_page;
$adjacents = 3;
$last = $max_pages - 1;
if($max_pages > 1)
{
//previous button
if (!($start<=0))
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$prev'>Prev</a> ";
//pages
if ($max_pages < 7 + ($adjacents * 2)) //not enough pages to bother breaking it up
{
$i = 0;
for ($counter = 1; $counter <= $max_pages; $counter++)
{
if ($i == $start)
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$i'><b>$counter</b></a> ";
}
else
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$i'>$counter</a> ";
}
$i = $i + $per_page;
}
}
elseif($max_pages > 5 + ($adjacents * 2)) //enough pages to hide some
{
//close to beginning; only hide later pages
if(($start/$per_page) < 1 + ($adjacents * 2))
{
$i = 0;
for ($counter = 1; $counter < 4 + ($adjacents * 2); $counter++)
{
if ($i == $start)
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$i'><b>$counter</b></a> ";
}
else
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$i'>$counter</a> ";
}
$i = $i + $per_page;
}
}
//in middle; hide some front and some back
elseif($max_pages - ($adjacents * 2) > ($start / $per_page) && ($start / $per_page) > ($adjacents * 2))
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=0'>1</a> ";
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$per_page'>2</a> .... ";
$i = $start;
for ($counter = ($start/$per_page)+1; $counter < ($start / $per_page) + $adjacents + 2; $counter++)
{
if ($i == $start)
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$i'><b>$counter</b></a> ";
}
else
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$i'>$counter</a> ";
}
$i = $i + $per_page;
}
}
//close to end; only hide early pages
else
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=0'>1</a> ";
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$per_page'>2</a> .... ";
$i = $start;
for ($counter = ($start / $per_page) + 1; $counter <= $max_pages; $counter++)
{
if ($i == $start)
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$i'><b>$counter</b></a> ";
}
else
{
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$i'>$counter</a> ";
}
$i = $i + $per_page;
}
}
}
//next button
if (!($start >=$foundnum-$per_page))
echo " <a href='trypaginate2.php?search=$search&submit=Search+source+code&start=$next'>Next</a> ";
}
echo "</center>";
}
}
?>
编辑！现在更改了我的PHP代码我在第34行收到错误。错误是注意：未定义的变量：在C：\ xampp \ htdocs中搜索第34行的\ eventreg \ trypaginate2.php
答案 0 :(得分：0)
你不应该通过盲目地将变量分配给这些值甚至使用array_key_exists('submit', $_GET)来检查数组中是否存在某个键（这是$ _POST和$ _GET是什么） - 即使我知道这似乎喜欢它会有意义。这就是PHP向您发送警告的行为。该错误来自于尝试查找诸如$ _POST [＆＃39; search＆＃39;]或$ _GET [＆＃39; submit＆＃39;]之类的值，当这些值未在该数组中设置时。
而是使用array_key_exists('search', $_POST)或GetAsyncKeyState来检查是否设置了这些值。如果该表达式的计算结果为true，那么您可以继续访问代码中的这些值，并且不应在日志中收到任何通知。