PHP implements question highlighting and code formatting functions in knowledge Q&A websites.

PHP implements question highlighting and code formatting functions in the knowledge Q&A website

With the development of the Internet, the knowledge Q&A website has become an important platform for everyone to obtain and share knowledge. In such a website, problem highlighting and code formatting functions are very important. They can help users understand problems and solutions more clearly and improve user experience. This article will introduce how to use PHP to implement these functions and give corresponding code examples.

1. Question Highlighting Function

The question highlighting function is mainly used to highlight keywords or key content in questions to help users find the questions they are interested in more quickly. The following is a sample code that demonstrates how to use PHP to implement the question highlighting function:

function highlightKeywords($question, $keywords)
{
    // 将问题中的关键词用特殊样式标记出来
    foreach ($keywords as $keyword) {
        $question = str_ireplace($keyword, "$keyword", $question);
    }
    
    return $question;
}

// 使用示例
$question = "如何使用 PHP 实现问题高亮功能？";
$keywords = ["PHP", "问题高亮"];

$highlightedQuestion = highlightKeywords($question, $keywords);
echo $highlightedQuestion;

In the above example, we define a function highlightKeywords($question, $keywords), Accepts two parameters: question and keyword array. The function uses PHP's str_ireplace() function to replace the keywords in the question with HTML tags with special styles to achieve a highlighting effect. Finally, we output the highlighted questions to the page.

It should be noted that we use the CSS style class name highlight to define the style of problem highlighting. You can modify or add this style according to your needs.

2. Code formatting function

In knowledge question and answer websites, users often share codes. In order to better display the code and improve the reading experience, we can format the code. The following is a sample code that demonstrates how to use PHP to implement code formatting function:

function formatCode($code)
{
    // 替换缩进符
    $code = str_replace("    ", "    ", $code);
    
    // 替换换行符和空格
    $code = nl2br(htmlentities($code));
    
    // 添加代码块标签
    $code = "
$code
";
    
    // 返回格式化后的代码
    return $code;
}

// 使用示例
$code = "
Copy after login

In the above example, we define a function formatCode($code), which accepts one parameter : The code to be formatted. The function uses PHP's str_replace() function to replace tabs with spaces so that indentation appears correctly in HTML. Then use the nl2br() and htmlentities() functions to replace newlines and spaces to fit the HTML display rules. Finally, the

 tag is added outside the code to define the style of the code block. 

It should be noted that we use the htmlentities() function to escape special characters in the code to prevent the injection of malicious code. 
Summary
In this article, we introduced how to use PHP to implement question highlighting and code formatting functions in a knowledge Q&A website. The problem highlighting function can help users find key problems faster, and the code formatting function can improve the user's experience of reading code. Through the above code examples, you can quickly implement these functions and extend and modify them according to your own needs. Hope this article can be helpful to you! 
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