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How to use keyword query written in php

藏色散人Original: 2021-07-01 09:17:543204browse

How to write keyword query in PHP: first get the keyword text input from the text box; then connect to the database to query, and query the records containing the keyword text in the book title or description; finally Just display the query results in a loop.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How to write keyword query in php ?

PHP realizes the highlight function after keyword search:

When I first started learning PHP, I was curious about the keyword highlight after search, but in the past few days, I have consolidated it. When I learned the basics of PHP, I found that it was not difficult to achieve such an effect. As usual, let me show you the renderings first.

Running renderings

How to use keyword query written in php

Database related

The database name is Book has only one database table, which is also a book, and simulates 5 pieces of data.
The name field is the title of the book, and the description field is the description of the book

How to use keyword query written in php

##Code

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title></title>
  <link rel="stylesheet" href="">
</head>
<body>
<form action="14.php" method="post">
  请输入关键字：<input type="text" name="keyword">
  <input type="submit" value="提交" />
</form>
<?php
  if(!empty($_POST[&#39;keyword&#39;])){
    $keyword = $_POST[&#39;keyword&#39;];//获取输入的关键字
    //进行数据库连接
    $conn = mysql_connect("localhost","root","1234");
    if(!$conn){
      die("数据库连接失败");
    }
    $flag = mysql_select_db("book",$conn);
    if(!$flag){
      die("数据库打开失败");
    }
    mysql_query("set names utf8");
    $sql = "select * from book where name like &#39;%$keyword%&#39; or description like &#39;%$keyword%&#39;";
    $result = mysql_query($sql,$conn);
    while($row = mysql_fetch_assoc($result)){
?>
<p style="width:300px;height:100px;background-color: #ccc;margin-bottom: 10px">
  <p>书名：<?php echo str_ireplace($keyword, "<font color=&#39;#f00&#39;>$keyword</font>",$row[&#39;name&#39;])?></p>
  <p>描述：<?php echo str_ireplace($keyword, "<font color=&#39;#f00&#39;>$keyword</font>",$row[&#39;description&#39;])?></p>
</p>
<?php
  }
}else{
  echo "很遗憾，没有找到书籍";
}
?>
</body>
</html>

Finally, let’s talk about the implementation principle. First, get the keyword text input from the text box, and then connect to the database to query, query the records containing the keyword text in the book title or description, and display the query results in a loop. , when displaying the book title and description, use the

str_ireplace() function to replace the keyword text with red text to achieve the effect of keyword highlighting.

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