Remove Action (PHP, WordPress) called internally
This article aims to provide two methods to help developers remove hooks added using add_action inside class methods in the functions.php file of WordPress theme. In case of situations where it cannot be removed directly through remove_action, this article provides two solutions and emphasizes the importance of priority to ensure that the target Action can be successfully removed.
In WordPress development, we often need to remove hooks added through add_action. However, when add_action is called inside the class's method, using remove_action directly may fail. The following are two ways to remove such Actions.
Method 1: Use global variables
If the FLBuilderFonts class has been instantiated and assigned to the global variable, the Action can be removed directly through the global variable.
global $FLBuilderFonts; remove_action( 'wp_head', array( $FLBuilderFonts, 'preload' ), 5 );
Notes:
- Make sure the $FLBuilderFonts variable has been assigned correctly before the remove_action call. If the FLBuilderFonts class is instantiated in a plugin or other file in the theme, you need to make sure that the file is loaded before calling remove_action.
- The third parameter of remove_action, 5, must be consistent with the priority parameter used in add_action. If priority levels are inconsistent, remove_action will not take effect.
Method 2: Use Action hook and instantiation
If you cannot directly access the instantiated FLBuilderFonts object, you can add a new Action on the wp_head hook and instantiate the FLBuilderFonts class in that Action and remove the target Action.
add_action( 'wp_head', 'remove_preload_action', 10 );
function remove_preload_action() {
$FLBuilderFonts = new FLBuilderFonts();
remove_action( 'wp_head', array( $FLBuilderFonts, 'preload' ), 5 );
}
Code explanation:
- add_action( 'wp_head', 'remove_preload_action', 10 );: Add a new Action on the wp_head hook, the function is called remove_preload_action, and the priority is 10.
- function remove_preload_action() { ... }: Define the remove_preload_action function, which will be executed when the wp_head hook is triggered.
- $FLBuilderFonts = new FLBuilderFonts();: Instantiate the FLBuilderFonts class inside the function.
- remove_action( 'wp_head', array( $FLBuilderFonts, 'preload' ), 5);: Remove the target Action using the newly instantiated object.
Notes:
- Make sure that the priority of the remove_preload_action function is higher than that of the original add_action. In this example, the original add_action has a priority of 5, and remove_preload_action has a priority of 10, so you can make sure to add Action first and then remove Action.
- If the above method still doesn't work, try adjusting the priority of remove_preload_action so that it executes after add_action.
Summarize
Removing Actions called internally by class methods requires special attention to scope and priority. The target Action can be effectively removed by using global variables or instantiating the class in the Action hook. Ensuring that priority is set correctly is the key to successfully removing Action. If the problem persists, double-check the code to confirm that the class is instantiated correctly and whether the priority is conflicting.
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