为什么我的搜索字词的第一个结果总是不会出现？
我注意到只有在我导航到页码0时才会显示。
我该如何解决这个问题？
我希望当我导航到页码1时，第一个结果也会出来！
PHP代码：
<?php
//php code goes here
include 'connect.php'; // for database connection
include 'script_suggestion.php';
include 'script_close_suggestion_box.php';
$query = $_GET['q']; // query
$button = $_GET ['submit'];
if (isset($_GET['page'])) {
$page_number = (int)$_GET['page'];
$page_number = mysqli_real_escape_string($page_number);
} else {
$page_number = 1;
}
$results_per_page = 10;
?>
HTML代码：
<html>
<head>
<title>
Brandon's Search Engine
</title>
<style type="text/css">
#title a {
font-size: 17pt;
margin: 5px;
padding: 2px;
border-color: black;
text-decoration: underline;
width: 544px;
}
#search-result {
display: block;
border: 1px solid grey;
border-color: grey;
}
#search-result:hover {
background-color: #dddddd;
width: 544px;
}
#link {
font-size: 17pt;
margin: 5px;
padding: 2px;
width: 544px;
}
#description {
font-size: 17pt;
margin: 5px;
padding: 2px;
width: 544px;
}
#search-page-number {
display: block;
width: auto;
height: auto;
border: 1px solid gray;
margin: 2px;
padding-left: 5px;
padding-right: 5px;
padding-bottom: 2px;
padding-top: 2px;
list-style: none;
float: left;
text-align: center;
}
#search-page-number:hover {
background-color: #dddddd;
}
#suggestion {
border: 1px solid black;
visibility: hidden;
position: absolute;
background-color: white;
z-index: 10;
}
#suggestion a {
font-size: 12pt;
color: black;
text-decoration: none;
display: block;
width: 548px;
height: auto;
text-align: left;
padding: 2px;
}
#suggestion a:hover {
background-color: #dddddd;
width: 544px;
padding: 2px;
}
</style>
</head>
<body>
<form method="GET" action="search.php">
<table>
<tr>
<td>
<h2>
Brandon's Search Engine
</h2>
</td>
</tr>
<tr>
<td>
<input type="text" value="<?php echo htmlspecialchars($_GET['q']); ?>" name="q" style="height: 27px; width: 550px; padding: 2px" name="q"
onkeyup="getSuggestion(this.value)" autocomplete="off" onblur="closeBox()" placeholder="Search Now"/>
<input type="submit" value="Search" style="height: auto; width: 60px; padding: 2px" />
<div id="suggestion" style="width: 548px">
</div>
</td>
</tr>
</table>
<br>
<hr>
<table>
<tr>
<td>
<?php
//count
$count_sql = "SELECT count(*) as c FROM searchengine WHERE title LIKE '%" . mysqli_real_escape_string($con,$query) . "%' OR keywords LIKE '%" . mysqli_real_escape_string($con,$query) . "%' OR link LIKE '%" . mysqli_real_escape_string($con,$query) . "%' ";
$search_count = mysqli_fetch_array(mysqli_query($con,$count_sql));
$number_of_result = $search_count['c'];
//SQL query
$page_number = (int)$_GET['page'];
$stmt = "SELECT * FROM searchengine WHERE title LIKE '%" . mysqli_real_escape_string($con,$query) . "%' OR keywords LIKE '%" . mysqli_real_escape_string($con,$query) . "%' OR link LIKE '%" . mysqli_real_escape_string($con,$query) . "%' LIMIT " . $page_number . " , $results_per_page";
$result = mysqli_query($con,$stmt) or die(mysqli_error($con));
//$number_of_result = mysqli_num_rows($result);
if ($number_of_result < 1) {
echo "<b>No results found!</b>";
echo "<p>";
echo "Your search - <b>$query</b>" . " - did not match any documents. Please try different keywords.";
}
elseif ($number_of_result > 1) {
echo "<b>$number_of_result results found!</b>";
echo "<p>";
//results found here and display them
while (($row = \mysqli_fetch_array($result))) {//10 results per page
$title = $row["title"];
$description = $row["description"];
$link = $row["link"];
echo "<div id='search-result'>";
echo "<div id='title'><a href='$link'>" . $title . "</a></div>";
//echo "<br />";
echo "<div id='link'><small>" . $link . "</small></div>";
//echo "<p>";
echo "<div id='description'><small>" . $description . "</small></div>";
echo "</div>";
echo "<br />";
}
}
elseif ($number_of_result == 1) {
echo "<b>$number_of_result result found!</b>";
echo "<p>";
//results found here and display them
while (($row = \mysqli_fetch_array($result))) {//10 results per page
$title = $row["title"];
$description = $row["description"];
$link = $row["link"];
echo "<div id='search-result'>";
echo "<div id='title'><a href='$link'>" . $title . "</a></div>";
//echo "<br />";
echo "<div id='link'><small>" . $link . "</small></div>";
echo "<br />";
echo "<div id='description'><small>" . $description . "</small></div>";
echo "</div>";
echo "<br />";
}
}
?>
</td>
</tr>
<tr>
<td>
<input type="hidden" name="page" value="<?php echo 1; ?>" />
<div id="page-number">
<?php
$max_page_number = ceil($number_of_result / $results_per_page);
if ($number_of_result == 0) {
echo " ";
}
elseif ($number_of_result != 0) {
echo "You are on page $page_number of $max_page_number.";
}
//ie if 35 results are therer then we require 4 pages that are 0 to max_page_number
//current page number is equal to page_number
//echo $max_page_number;
echo "<ul>";
//both the condition are not the neccesary
if ($max_page_number >= 1) { // if more than 2 pages
if ($page_number != 1) { //First
echo "<li id='search-page-number'>";
echo "<a href=search.php?q=$query&page=1>First</a>";
echo "</li>";
}
if ($page_number != 1) { //Previous
echo "<li id='search-page-number'>";
$prev = $page_number - 1;
echo "<a href=search.php?q=$query&page=".($prev).">Previous</a>";
echo "</li>";
}
for($index = 1 ; $index <= $max_page_number ; $index++) {
echo "<li id='search-page-number'>";
echo "<a href=search.php?q=$query&page=".($index).">";
echo ($index) . "</a>";
echo "</li>";
}
if ($page_number != $max_page_number) { //Next
echo "<li id='search-page-number'>";
$next = $page_number + 1;
echo "<a href=search.php?q=$query&page=".($next).">Next</a>";
echo "</li>";
}
if ($page_number != $max_page_number) { //Last
echo "<li id='search-page-number'>";
echo "<a href=search.php?q=$query&page=".($max_page_number).">Last</a>";
echo "</li>";
}
} elseif (($max_page_number == 1 ) ) {
echo "<li id='search-page-number'>";
echo "<a href=search.php?q=$query&page=1>1</a>";
echo "</li>";
}
echo "</ul>";
?>
</div>
</td>
</tr>
<tr>
<td align="center">
To insert your site in result fill in the form at <a href="insert.php">here</a>.
</td>
</tr>
</table>
</form>
</body>
</html>
答案 0 :(得分：2)
您的查询以：
结尾"LIMIT " . $page_number . ", $results_per_page"
但这不是LIMIT子句在SQL中的工作方式。它被定义为：
LIMIT offset, row_count
offset是一个行号，从0开始。所以如果你这样做：
LIMIT 1, 10
您将获得记录2到11，而不是1到10.正确的方法是：
"LIMIT " . ($page_number-1)*$results_per_page . ", $results_per_page"
您应该发现有用的其他内容是SQL_CALC_FOUND_ROWS语句的SELECT选项。这告诉MySQL计算符合条件的总行数，即使您使用LIMIT仅返回一个子集。这样您就不必进行两次查询，一次查询COUNT(*)，另一次查询获取一页数据。使用此选项进行查询后，您可以使用SELECT FOUND_ROWS()获取完整计数。
$safequery = mysqli_real_escape_string($con,$query);
$stmt = "SELECT SQL_CALC_FOUND_ROWS *
FROM searchengine
WHERE title LIKE '%" . $safequery . "%'
OR keywords LIKE '%" . $safequery . "%'
OR link LIKE '%" . $safequery . "%'
LIMIT " . ($page_number-1)*results_per_page . " , $results_per_page";
$result = mysqli_query($con,$stmt) or die(mysqli_error($con));
$count_sql = "SELECT FOUND_ROWS() AS c";
$search_count = mysqli_fetch_array(mysqli_query($con,$count_sql));
$number_of_result = $search_count['c'];