Display Information About the Registered Actions and Filters in Wordpress

474.php

<?php

function wp_filter_dump($name) {
  global $wp_filter;

  $handlers = array();

  if (!isset($wp_filter[$name])) {
    return $handlers;
  }

  foreach ($wp_filter[$name] as $priority => $callbacks) {
    foreach ($callbacks as $callback) {
      $handler = array(
        'function'      => null,
        'priority'      => $priority,
        'accepted_args' => $callback['accepted_args'],
        'file'          => null,
        'line'          => null,
        'error'         => null,
      );
      try {
        // Handle static functions
        if (is_string($callback['function']) && strpos($callback['function'], '::')) {
          $handler['function'] = $callback['function'];
          $ref = new \ReflectionClass(strstr($callback['function'], '::', true));
          $handler['file'] = $ref->getFileName();
          try {
            $handler['line'] = $ref->getMethod(substr($callback['function'], strpos($callback['function'], '::') + 2))->getStartLine();
          }
          catch (\ReflectionException $e) {
            $handler['error'] = $e->getMessage();
          }
        }

        // Handle functions
        elseif (is_string($callback['function'])) {
          $handler['function'] = $callback['function'];
          $ref = new \ReflectionFunction($callback['function']);
          $handler['file'] = $ref->getFileName();
          $handler['line'] = $ref->getStartLine();
        }

        // Handle methods
        elseif (is_array($callback['function'])) {
          $ref = new \ReflectionClass($callback['function'][0]);
          $handler['function'] = $callback['function'];
          if (is_object($callback['function'][0])) {
            $handler['function'][0] = get_class($handler['function'][0]);
          }
          $handler['function'] = 'array('.implode(',',$handler['function']).')';
          $handler['file'] = $ref->getFileName();
          try {
            if (strpos($callback['function'][1], 'parent::')) {
              $handler['line'] = $ref->getParentClass()->getMethod(substr($callback['function'][1], strpos($callback['function'][1], '::') + 2))->getStartLine();
            } else {
              $handler['line'] = $ref->getMethod($callback['function'][1])->getStartLine();
            }
          }
          catch (\ReflectionException $e) {
            $handler['error'] = $e->getMessage();
          }
        }

        // Handle closures
        elseif (is_a($callback['function'], 'Closure')) {
          $handler['function'] = get_class($callback['function']);
          $ref = new \ReflectionFunction($callback['function']);
          $handler['file'] = $ref->getFileName();
          $handler['line'] = $ref->getStartLine();
        }

        // Handle unrecognized
        else {
          $handler['error'] = 'Handler has an unrecognized callable signature.';
        }
      }
      catch (\ReflectionException $e) {
        $handler['error'] = $e->getMessage();
      }

      $handlers[] = $handler;
    }
  }

  return $handlers;
}