5 Essential WordPress Filter Functions

WordPress for amateurs is a different territory but when it comes to professional WordPress development then deep understanding of filters and actions is important. Understanding how WordPress hooks work is important to implement extensions, WordPress plugins, customizations and various other enhanced WordPress tools. WordPress Filter functions are required for plugin development.

WordPress Filter Functions

1. has_filter

This filter acts like a check in looking up whether other filters have been incorporated for getting a specific hook. has_filter is more like a conditional filter function having two parameters that add proper set of value, routine, variation and equation. The first parameter is the name that checks and the second parameter is the function that checks against the filter. The second parameter works in cases where there is no filter for a specific hook and false result is shown and in places where a filter is found this function shows true.

2. apply_filters_ref_array

This filter function takes in a variety of arguments and does not accept several values. The function of this filter is a bit similar to apply_filters yet the former works a bit differently in the way its parameters work. A passed parameter works with reference and not with value. There are two parameters with the first one being the filter hook’s name and the second one being an array of arguments that are passed. In order to load posts several long code variables are used to achieve the WordPress functions.

3. current_filter

A filter hook that has been executed is given a name by this WordPress filter function. current_filter does not work with filter hooks. It is applied with action hooks to acquire name of the current filter or the name for the action hook.  Whenever a single function is required for several hooks, current_filter is applied by WordPress developers to achieve the function. Content filtering is successfully done with the help of current_filter function. There are a set of words and texts that need to be used and replaced in order to get a desired change in text or content.

4. remove_filter

Registered filters created for a specific filter hook is removed with the help of remove_filter. This function will work only when a filter has been registered using add_filter() function. Breaks in filters can be incorporated with the help of this filter. Double line breaks and shifts in paragraphs can be brought about by remove_filter.

5. remove_all_filters

Developers often find filters to impede certain development processes. While developing a WordPress plugin there will often be times when priorities are set and in order to run proper functions removing all filters become all important. This function also has two parameters such as name of the filter hook that needs to be removed and the second one is the filters’ priority that needs to be removed from the filter hook. This function will allow removal of default formatting. A set of codes with characters will change the content structure and let additional entities be addd to the content.

WordPress Filter Functions are important to know while a website is being developed in WordPress. There are tutorials available to give insights for WordPress plugin development.

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