How to remove html tags in laravel (two methods)

Laravel is a popular PHP web framework that provides many useful features to help you build web applications easily. You may have noticed that when using raw input in Laravel, the HTML tags are also included. This problem can be solved by using some methods provided by Laravel, which this article will explore.

Why do you need to remove HTML tags?

In web development, security is often an important issue. Malicious users can attack your web application by submitting HTML forms containing malicious scripts or code. To prevent this attack, you can increase the security of your web application by stripping HTML tags from user input.

In addition to security reasons, removing HTML tags also helps prevent unnecessary HTML tags from being displayed in the text and reduces database space usage.

Method 1: Use Laravel's strip_tags function

Laravel provides a built-in function strip_tags, which can be used to remove HTML tags from the input string. Here is sample code using this function:

$input = '<p>这是一个带有HTML标记的文本字符串。</p>';
$output = strip_tags($input);

In this example, the variable $input contains an HTML string and the $output variable contains the text string after removing the HTML tags.

The strip_tags function also has some optional parameters that you can use to specify the tags you want to keep. By default, this function removes all markers. Here is an example of retaining the href attribute of the a tag:

$input = '<p>这只是一个 <a>链接</a>。</p>';
$output = strip_tags($input, '<a>');</a>

This will retain only the a tag and remove that other tag.

Method 2: Use Laravel’s Purifier package

In addition to the strip_tags function, Laravel also provides another powerful method to remove HTML tags. This method uses a PHP library called Purifier, which provides more advanced features such as filtering unsafe tags and attributes, filtering XSS attacks, etc.

To use the Purifier package, you need to install it through Composer. Open a terminal and execute the following command:

composer require ezyang/htmlpurifier

Once the installation is complete, you need to use the following command to create a Purifier instance:

use \HTMLPurifier;
$config = \HTMLPurifier_Config::createDefault();
$purifier = new \HTMLPurifier($config);

Now, you can use the purify method to filter HTML tags. Here is an example:

$input = '<p>这是一个带有HTML标记的文本字符串。</p>';
$output = $purifier->purify($input);

This will use the Purifier package to remove HTML tags from the input string and save the result into the $output variable.

Conclusion

It is very easy to remove HTML tags in Laravel. You can use the built-in strip_tags function as well as the third-party library Purifier to achieve this. No matter which method you choose, you should pay attention to security issues to ensure that your web application is safe from malicious attacks.

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