A quick introduction
WordPress offers filter hooks to allow plugins to modify various types of internal data at runtime.
A plugin can modify data by binding a callback to a filter hook. When the filter is later applied, each bound callback is run in order of priority, and given the opportunity to modify a value by returning a new value.
The following example shows how a callback function is bound to a filter hook.
Note that $example is passed to the callback, (maybe) modified, then returned:
function example_callback( $example ) {
// Maybe modify $example in some way.
return $example;
}
add_filter( 'example_filter', 'example_callback' );If you want to know more, before adding your first add_filter(), see below source. If it’s now your first time, see our collection of filters below.
source: https://developer.wordpress.org/reference/functions/add_filter/
If you have never used add_filter() or other functions to modify .php files in your theme or plugin files. Please make sure you have a back-up of the file you’re modifying and quick access to your FTP to revert back if anything goes wrong.
Adding your filters with Must-Use Plugins. It’s really simple!
Adding filters and hooks for our plugin might look difficult, but it can be done quite easy. Copy/Paste below the needed snippet below in your favorite text editor and follow the instructions in our article about MU Plugins.
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