这基于以下示例：
http://www.w3schools.com/php/php_ajax_database.asp
区别在于：
以下是主页：
<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script>
function showUser() {
var selectedPerson = $('#testform').serialize();
$.ajax({
url:'getuser.php',
type:'post',
data:selectedPerson,
success:function(res){
$('#txtHint').html(res);
}
})
}
</script>
</head>
<body>
<form id="testform">
<input onchange="showUser();" name="person[]" type="checkbox" value="100">One<br>
<input onchange="showUser();" name="person[]" type="checkbox" value="200">Two<br>
<input onchange="showUser();" name="person[]" type="checkbox" value="300">Three<br>
<input onchange="showUser();" name="person[]" type="checkbox" value="400">Four<br>
<input onchange="showUser();" name="person[]" type="checkbox" value="500">Five<br>
</form>
<br>
<div id="txtHint"><b>Person info will be listed here...</b></div>
</body>
</html>
以下是getuser：
<!DOCTYPE html>
<html>
<head>
<style>
table {
width: 100%;
border-collapse: collapse;
}
table, td, th {
border: 1px solid black;
padding: 5px;
}
th {text-align: left;}
</style>
</head>
<body>
<?php
$person = '';
$person = isset($_POST['person']) ? $_POST['person'] : '';
$allIds = '';
if($person != ''){
foreach($person as $personid){
$allIds .= $personid.',';
}
$personid = rtrim($allIds,',');
}
include("includes/db.php");
global $con;
$sql = "SELECT * FROM courses WHERE course_duration IN ( = '" . $personid . "') LIMIT 10";
$result = mysqli_query($con,$sql);
$sqlCount = "SELECT * FROM courses WHERE course_duration IN ( = '" . $personid . "')";
$get_crs_count = mysqli_query($con, $sqlCount);
$count_rows = mysqli_num_rows($get_crs_count);
echo '<p style="margin-bottom: 8px;margin-top: 8px;font-size:18px;"><b>Number of courses available: </b>' . $count_rows;
while($row_crs = mysqli_fetch_array($result)){
$crs_id = $row_crs['course_id'];
$crs_cat = $row_crs['course_cat'];
$crs_provider = $row_crs['course_provider'];
$crs_title = $row_crs['course_title'];
$crs_price = $row_crs['course_price'];
$crs_city = $row_crs['course_city'];
$crs_category = $row_crs['course_cat1'];
$crs_date = $row_crs['course_date1'];
$crs_sdesc = $row_crs['course_sdesc'];
$crs_shortdesc = mb_strimwidth("$crs_sdesc",0,140,"...");
$crs_image = $row_crs['course_image'];
$provider_image = $row_crs['provider_image'];
echo "
<article class='search-result row'>
<center>
<div class='col-xs-12 col-sm-12 col-md-3' id='thumbnailContainer'>
<a href='#' title='Lorem ipsum' class='thumbnail' id='resultThumbnail'><img src='$provider_image' /></a>
<a href='searchPage.php?crs_price=$crs_price' style='color:black;'>
<button id='resultprice'>
<span id='resultpriceText'>$ $crs_price</span>
</button>
</a>
</div>
<div class='col-xs-12 col-sm-12 col-md-2'>
<ul class='meta-search' id='listDesign'>
<a href='searchPage.php?crs_date=$crs_date' style='color:white;'>
<li>
<button id='resultInfo'>
<i class='fa fa-calendar fa-1x'>
<span id='iconText'> $crs_date</span>
</i>
</button>
</li>
</a>
<a href='searchPage.php?crs_category=$crs_category' style='color:white;'>
<li>
<button id='resultInfo2'>
<i class='fa fa fa-tags fa-1x'>
<span id='iconText'> $crs_category</span>
</i>
</button>
</li>
</a>
<a href='searchPage.php?crs_provider=$crs_provider' style='color:white;'>
<li>
<button id='resultInfo'>
<i class='fa fa-graduation-cap fa-1x'>
<span id='iconText'> $crs_provider</span>
</i>
</button>
</li>
</a>
<a href='searchPage.php?city=$crs_city' style='color:white;'>
<li>
<button id='resultInfo'>
<i class='fa fa-map-marker fa-1x'>
<span id='iconText'> $crs_city</span>
</i>
</button>
</li>
</a>
</ul>
</div>
</center>
<div class='col-xs-12 col-sm-12 col-md-7 excerpet'>
<h3 id='resultHeading'>
<a href='coursePage.php?crs_id=$crs_id' id='headingLinking'><b>$crs_title</b></a>
</h3>
<div id='courseshortDescription'>
$crs_shortdesc
<center>
<a href='coursePage.php?crs_id=$crs_id' style='color:white;'>
<button class='btn btn-danger' id='findoutBtn'>Find Out More</button>
</a>
</center>
</div>
<span class='clearfix borda'></span>
</article>";
}
echo "</table>";
mysqli_close($con);
?>
</body>
</html>
我的问题在于以下几行：
$sql= "SELECT * FROM courses WHERE course_duration IN ( = '" . $personid . "') LIMIT 10";
$result = mysqli_query($con,$sql);
$sqlCount = "SELECT * FROM courses WHERE course_duration IN ( = '" . $personid . "')";
$get_crs_count = mysqli_query($con, $sqlCount);
我收到以下错误：
Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean given in C:\xampp\htdocs\test\getuser.php on line 42
Number of courses available:
Warning: mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given in C:\xampp\htdocs\test\getuser.php on line 44
我正在努力解决它，我不知道问题的核心在哪里。我知道例如当我将行更改为：＆＃34; SELECT * FROM courses WHERE course_duration =＆＃39;＆＃34;。$ personid。＆＃34;＆＃39;＆＃34 ;;它的工作原理，但问题是我必须使用IN，否则我将无法组合多个复选框，如果我选择复选框2和3，只有最后一次单击的结果和只能选择一个的结果将显示