What is WordPress Hook: pre_upload_error
The pre_upload_error hook in WordPress is used to perform actions before an upload error is returned. This hook allows developers to modify or handle errors that occur during the file upload process in WordPress.
Understanding the Hook: pre_upload_error
The pre_upload_error hook is located within the wp_handle_upload_error function in the wp-admin/includes/file.php file. This function is responsible for handling file upload errors in WordPress. The pre_upload_error hook is triggered before an error is returned, allowing developers to intervene and customize error handling.
Hook Parameters (if applicable): pre_upload_error
The pre_upload_error hook does not accept any parameters or arguments. It is a simple action hook that allows developers to execute custom code before an upload error is returned.
Hook Doesn’t Work: pre_upload_error
If the pre_upload_error hook doesn’t seem to work, it could be due to the hook not being properly added or the code containing errors. Ensure that the hook is added using the correct syntax and that there are no typos in the code. Additionally, check for any conflicts with other plugins or themes that may be affecting the hook’s functionality.
Best Practices & Usage Notes (if applicable): pre_upload_error
When using the pre_upload_error hook, it’s important to keep the custom code lightweight and efficient, as it is triggered during the file upload process, which can impact site performance. Additionally, developers should be mindful of the potential impact on user experience when customizing error handling.
Usage Example: pre_upload_error
“`php
function custom_upload_error_handler( $error ) {
// Custom error handling logic
// Modify or customize the error message
return $error;
}
add_filter( ‘pre_upload_error’, ‘custom_upload_error_handler’ );
“`
