How to use PHP to develop full-text search and keyword query in CMS

With the continuous development of Internet technology, content management systems (CMS) play an increasingly important role in network applications. CMS can make it easier for website administrators and creators to maintain website content, and full-text search and keyword query are one of the commonly used functions in CMS. PHP is a widely used web development language. This article will introduce how to use PHP to implement full-text search and keyword query in CMS.

1. Full-text search

Full-text search refers to searching for specific keywords or phrases in the entire article. In order to implement the full-text search function in CMS, you need to use the full-text search function of MySQL. At the same time, the following code can also be used in other databases.

1.1 Create a search form

Creating a search module in a CMS website is a critical task. The general skill level and usage patterns of website users must be taken into consideration. Below is a simple search form containing a text input box and a submit button.

<form action="search_results.php" method="post">
    <input type="text" name="search_keyword">
    <input type="submit" name="submit" value="Search">
</form>

1.2 Implementing the search function

After entering keywords in the search form, you need to insert the keywords into the query statement. The following is a basic MySQL full-text search query statement.

SELECT * FROM `articles` WHERE MATCH (`title`, `content`) AGAINST ('$search_keyword')

In this query statement, we query whether the "title" and "content" fields in the "articles" table contain the search keyword "$search_keyword". When a keyword is matched, all content of the article is returned. It should be noted that in PHP code, search keywords must be escaped using MySQL's "mysqli_real_escape_string()" function to ensure the correctness and security of SQL statements.

$search_keyword = mysqli_real_escape_string($con, $_POST['search_keyword']);

2. Keyword query

In addition to full-text search, CMS also needs a keyword query function. This function is used to query all related keywords based on the keywords provided by the user. article.

2.1 Create keyword query form

In the website, for keyword query, if the country contains some keywords that are more important, the user can enter the keyword and select its importance, thereby Filter the results returned by the application. Below is a search form with three levels of selectors.

<form action="search_results.php" method="post">
    <input type="text" name="search_keyword">
    <select name="importance">
        <option value="1">Low</option>
        <option value="2">Medium</option>
        <option value="3" selected>High</option>
    </select>
    <input type="submit" name="submit" value="Search">
</form>

2.2 Implement keyword query function

In the implementation of keyword query, it is necessary to combine MySQL’s “LIKE” operator and “AND/OR” logical operator. The following is a basic query statement for a keyword query. Among them, in actual applications, $conn needs to be changed to the correct connection to the database.

$conn = mysqli_connect($servername, $username, $password, $dbname);
$search_keyword = mysqli_real_escape_string($conn, $_POST['search_keyword']);
$importance = mysqli_real_escape_string($conn, $_POST['importance']);
$query = "SELECT * FROM articles WHERE ";
$query .= "(title LIKE '%$search_keyword%' ";
$query .= "OR content LIKE '%$search_keyword%') ";
if ($importance == 1) {
    $query .= "AND importance = 1";
} elseif ($importance == 2) {
    $query .= "AND importance = 2";
} elseif ($importance == 3) {
    $query .= "AND importance >= 3";
}
$result = mysqli_query($conn, $query);

In the query statement, first query whether the entered search keyword exists in the title or content. If it exists, continue to query articles with an importance equal to 1 or 2, and articles with an importance greater than or equal to 3. . There may be multiple results, and we can loop through them all to display them all. Similar methods can also be used for other functions in CMS, such as adding, editing and deleting articles.

The method introduced in this article is only a basic search and query implementation, and cannot meet the needs of all websites. It also needs to be expanded and optimized in practical applications. For example, you can use features such as advanced search, pagination, and sort search results. However, the above content can also serve as an introductory guide, allowing you to better understand how to use PHP to develop full-text search and keyword queries in CMS.

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