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Can you add functions to a parent theme?
What this means is: Unlike style.css, which overwrites the parent’s style.css, our child’s functions will complement or add to the functions of the parent theme. We should never define a new function in our child theme’s functions.php file with the same name used by an existing parent theme´s function, with the exceptions I will explain right now:
What happens if you override parent function in child theme?
Overriding the entire parent function within your child theme could lead to problems in the future. If the parent function is updated one day, your child theme will load the old version of the function and override the new one, which may lead to compatibility issues or even security vulnerabilities on your WordPress website.
Can a parent theme and child theme be pluggable?
Another thing to know is that if your parent and child themes have functions with the same name, this will break your site—unless the function in the parent theme is a pluggable function (more on this shortly). This is why it’s important to use prefixes for all your functions, and to use a different prefix in parent and child themes—just in case.
Can a parent theme override a child theme in WordPress?
If you’ve had any experience working with parent and child themes in WordPress, you’ll know that the template files in your child theme override those in your parent theme. For example, if your parent theme has a page.php file and you create a new one in your child theme, WordPress will use the one in the child theme when displaying pages.
How to assign priority to functions in WordPress?
When you write functions, you can assign them a priority, which tells WordPress when to run them. You do this when adding your function to an action or filter hook. WordPress will then run the functions attached to a given hook in ascending order of priority, so those with higher numbers will run last.