从php/mysql搜索程序中删除常见词

Question

好的，我对PHP很陌生，并且构建了一个问题/回答站点。我想要一个页面，用户可以在其中搜索问题表以找到问题，经过一些研究和工作后，我已经提出了这个问题，但我的问题是常见的话。如果用户在搜索中输入“is”，每个问题都会显示“is”。我的问题是1）我的这种搜索功能的方法是完全错误的吗？或2）是否有一种方法，我可以注入一个常用单词的数组，以便从查询中省略？

search_reslut.php：

<?php 


$servername = "127.0.0.1"; 
$username = "dylan326"; 
$password = ""; 
$dbname = "questions87"; 
$port = 3306; 

// Create connection 
$conn = new mysqli($servername, $username, $password, $dbname, $port); 
// Check connection 
if ($conn->connect_error) { 
    die("Connection failed: " . $conn->connect_error); 
} 

echo "Your search results: <br>"; 
echo "<br />"; 
$query = $_POST['query']; 

$query = "$query $query $query"; 
$pieces = explode(" ", $query); 
$qindex0 = $pieces[0]; // piece1 
$qindex1 = $pieces[1]; // piece2 
$qindex2 = $pieces[2]; // piece3 
$qindex3 = $pieces[3]; 
$qindex4 = $pieces[4]; 
$qindex5 = $pieces[5]; 
$qindex6 = $pieces[6]; 



echo $query; 

$sql = "select q_id, question, username, q_date from questions where (question like '%$qindex0%' or question like '%$qindex1%' or question like '%$qindex2%' or question like '%$qindex3%' 
or question like '%$qindex4%' or question like '%$qindex5%' or question like '%$qindex6%')"; 



$result = $conn->query($sql); 

if (mysqli_num_rows($result) > 0) { 
    // output data of each row 
    while($row = mysqli_fetch_array($result)){ 

     $question = $row['question']; 

echo ('<a href="totalqs.php?q_id=' . $row['q_id'] .'" >' . $question .'Asked by:'.' '.$row['username'].' '.$row['q_date'] .' </a>' . '<br>'); 


}} 

else {echo "No resluts found";} 




?> 

Answer 1

MySQL不得不做关键词搜索方便，比你在做什么更快的能力。这是通过MATCH(column) AGAINST ('words to search')语法完成的。将FULLTEXT索引添加到您的表格中，查找要进行搜索的列（question）。然后，像这样的工作，去返回的搜索词

// Get the query. escape all single quotes. 
$words = str_replace("'","\'",$_POST['query']); 

$sql = <<< "SQL" 
select q_id, question, username, q_date from questions 
where MATCH(`question`) AGAINST('$words' IN BOOLEAN MODE) 
SQL; 

$result = $conn->query($sql); 

的好处约FULLTEXT搜索的是，他们会自动排除在搜索你的常用词（停用词）至少一个所有问题。了解更多here以及here

如果你有停用词自定义列表，你可以从$words字符串删除它们执行查询

$stopWords = [ 
    '/is/', 
    '/the/' 
]; 

// Where is the cat >> Where cat 
$words = preg_replace($stopWords,'',$words); 

注from the docs前：

Full-text indexes can be used only with MyISAM tables. (In MySQL 5.6 and up, they can also be used with InnoDB tables.) Full-text indexes can be created only for CHAR, VARCHAR, or TEXT columns.