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How to sanitize and escape user data in WordPress?
Escape data as much as possible on output to avoid XSS and malformed HTML. Take a look through /wp-includes/formatting.php to see all of the sanitization and escaping functions WordPress has to offer. An earlier version of this article appeared on the WordPress.com VIP Publisher Blog.
What does WordPress store in MySQL database?
WordPress stores every single scrap of information within a MySQL database. Posts, pages, comments, shortcodes, plugin settings… absolutely everything. The WordPress backend is fantastic, and does allow you to manage and edit everything with ease, but only up to a certain point.
When do you save extra data in WordPress?
This commonly comes up when building a settings page for your theme, creating and manipulating shortcodes, or saving and rendering extra data associated with a post. There’s a distinction between how input and output are managed, however.
When to use ESC _ url function in WordPress?
WordPress thankfully has a few helper functions we can use for most of what we’ll commonly need to do: esc_html () we should use anytime our HTML element encloses a section of data we’re outputting. esc_url () should be used on all URLs, including those in the ‘src’ and ‘href’ attributes of an HTML element.
How is the escape keyword used in MySQL?
Escape keyword. The ESCAPE keyword is used to escape pattern matching characters such as the (%) percentage and underscore (_) if they form part of the data. Let’s suppose that we want to check for the string “67%” we can use; LIKE ’67#%%’ ESCAPE ‘#’;
When to be extra cautious when writing code for WordPress?
When writing code that will run across hundreds if not thousands of websites, you should be extra cautious of how you handle data coming into WordPress and how it’s then presented to the end user.
How to sanitize a search query in WordPress?
The search term ‘jumps’ out of the value attribute, and the following part of the data is interpreted as code and executed. To prevent this, WordPress provides get_search_query which returns the sanitized search query.