FilterHacks Trait

example.php

<?php

require_once( "trait.php" );

class Example {

  use FilterHacks;
  
  public function foo() {
    $this->_filter_hack_deque( 'bar' );
    
    // Do stuff.
    
    $this->_filter_hack_reque( 'bar' );
  }
  
}

trait.php

<?php

trait FilterHacks {

  protected $_filter_hacks_storage = [];

  public function _filter_hack_deque( $filter_name ) {
    if( is_array( $filter_name ) ) {
      foreach( $filter_name as $current_filter_name )
        $this->_filter_hack_deque( $current_filter_name );

      return;
    }

    global $wp_filter;

    if( !isset( $wp_filter[ $filter_name ] ) || !isset( $wp_filter[ $filter_name ]->callbacks ) || empty( $wp_filter[ $filter_name ]->callbacks ) )
      return;

    $this->_filter_hacks_storage[ $filter_name ] = $wp_filter[ $filter_name ]->callbacks;

    remove_all_filters( $filter_name );
  }

  public function _filter_hack_reque( $filter_name ) {
    if( is_array( $filter_name ) ) {
      foreach( $filter_name as $current_filter_name )
        $this->_filter_hack_reque( $current_filter_name );

      return;
    }

    if( !isset( $this->_filter_hacks_storage[ $filter_name ] ) )
      return;

    foreach( $this->_filter_hacks_storage[ $filter_name ] as $filter_priority => $filter_data )
      foreach( $filter_data as $current_filter_data )
        add_filter( $filter_name, $current_filter_data[ 'function' ], $filter_priority, isset( $current_filter_data[ 'accepted_args' ] ) ? $current_filter_data[ 'accepted_args' ] : 1  );
  }

}