What potential issues can arise from using the strip_tags() function in PHP without proper consideration?

Using the strip_tags() function in PHP without proper consideration can lead to the unintended removal of important content, such as text within HTML attributes or script tags. To prevent this, it is recommended to use the optional second parameter of strip_tags() to specify which tags are allowed to remain in the string. 

// Example of using strip_tags() with allowed tags specified
$allowed_tags = '<p><a>';
$cleaned_string = strip_tags($input_string, $allowed_tags);
echo $cleaned_string;

Keywords

strip_tags security vulnerability cross-site scripting input validation data sanitization

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