我有一个正在运行的搜索引擎，但仅当我搜索一个单词时。每当我搜索多个关键词时，我只得到一个结果。
示例：在我的数据库中，我有"test"answers"hello"这样的标签；每当我输入"测试你好"并点击"搜索"时，它就会显示：
1结果hello（这是带有标签=hello的帖子的标题）。
我的代码（search.php-我得到搜索结果的页面）：
<?php
$button = $_GET ['submit'];
$search = $_GET ['search'];
if(!$button) {
echo "you didn't submit a keyword";
} else {
if(strlen($search)<=1) {
echo "Search term too short";
} else {
echo "You searched for <b>$search</b> <hr size='1'></br>";
mysql_connect("localhost","root","root");
mysql_select_db("myschool");
$search_exploded = explode (" ", $search);
foreach($search_exploded as $search_each) {
$x = NULL;
$construct = NULL;
$x++;
if($x==1) {
$construct .="tag LIKE '%$search_each%'";
} else {
$construct .="OR tag LIKE '%$search_each%'";
}
$construct ="SELECT * FROM posts WHERE $construct";
$run = mysql_query($construct);
$foundnum = mysql_num_rows($run);
if ($foundnum==0) {
echo "Sorry, there are no matching result for <b>$search</b>.";
} else {
echo "$foundnum results found !<p>";
while($runrows = mysql_fetch_assoc($run)) {
$title = $runrows ['title'];
$tag = $runrows ['tag'];
echo "<a href='#'><b>$title</b></a><br>";
}
}
}
}
}
?>
问题可能出现在$x=++部分，因为我认为引擎没有显示甚至没有搜索数据库中的所有行，并且在num行计数>1时也没有显示。
提前感谢各位。
编辑：
我现在用上面的代码得到了多个结果，但我是以这种形式得到的：
你搜索了你好测试postare
找到1个结果！你好找到1个结果！
测试找到1个结果！
postare noua
我怎么能让它把结果加在一个地方，而不是每次发现不同关键字的新结果时都说出来？
您需要在foreach语句之前启动$x变量，如果您想将其用作整数，请不要将其设置为null。
$construct变量有同样的错误，您必须有三次相同的响应，这是因为在调用mysql-select之前必须关闭foreach语句。
$x = 1;
$construct = NULL;
foreach($search_exploded as $search_each)
{
if($x==1) {
$construct .="tag LIKE '%$search_each%'";
} else {
$construct .="OR tag LIKE '%$search_each%'";
}
$x++;
}
$select ="SELECT * FROM posts WHERE $construct";
...
上次编辑
<?php
$button = $_GET ['submit'];
$search = $_GET ['search'];
if(!$button) {
echo "you didn't submit a keyword";
} else {
if(strlen($search)<=1) {
echo "Search term too short";
} else {
echo "You searched for <b>$search</b> <hr size='1'></br>";
mysql_connect("localhost","root","root");
mysql_select_db("myschool");
$search_exploded = explode (" ", $search);
$x = 1;
$construct = '';
foreach($search_exploded as $search_each) {
if($x==1) {
$construct .="tag LIKE '%$search_each%'";
} else {
$construct .="OR tag LIKE '%$search_each%'";
}
$x++;
}
$select ="SELECT * FROM posts WHERE $construct";
$run = mysql_query($select);
$foundnum = mysql_num_rows($run);
if ($foundnum==0) {
echo "Sorry, there are no matching result for <b>$search</b>.";
} else {
echo "$foundnum results found !<p>";
while($runrows = mysql_fetch_assoc($run)) {
$title = $runrows ['title'];
$tag = $runrows ['tag'];
echo "<a href='#'><b>$title</b></a><br>";
}
}
}
}
?>
您的代码有几个问题。你错过了这条线上的一个"：
echo "Sorry, there are no matching result for <b>$search</b>";
并且最后一个else没有if