function get_option( $option, $default = false ) {
  global $wpdb;

  $option = trim( $option );
  if ( empty( $option ) )
    return false;

  
/**
 * Filters the value of an existing option before it is retrieved.
 *
 * The dynamic portion of the hook name, `$option`, refers to the option name.
 *
 * Passing a truthy value to the filter will short-circuit retrieving
 * the option value, returning the passed value instead.
 *
 * @since 1.5.0
 * @since 4.4.0 The `$option` parameter was added.
 * @since 4.9.0 The `$default` parameter was added.
 *
 *
 * @param bool|mixed $pre_option The value to return instead of the option value. This differs from
 *                               `$default`, which is used as the fallback value in the event the option
 *                               doesn't exist elsewhere in get_option(). Default false (to skip past the
 *                               short-circuit).
 * @param string     $option     Option name.
 * @param mixed      $default    The fallback value to return if the option does not exist.
 *                               Default is false.
 */
  $pre = apply_filters( "pre_option_{$option}", false, $option, $default );

  if ( false !== $pre )
    return $pre;

  if ( defined( 'WP_SETUP_CONFIG' ) )
    return false;

  // Distinguish between `false` as a default, and not passing one.
  $passed_default = func_num_args() > 1;

  if ( ! wp_installing() ) {
    // prevent non-existent options from triggering multiple queries
    $notoptions = wp_cache_get( 'notoptions', 'options' );
    if ( isset( $notoptions[ $option ] ) ) {
      
/**
 * Filters the default value for an option.
 *
 * The dynamic portion of the hook name, `$option`, refers to the option name.
 *
 * @since 3.4.0
 * @since 4.4.0 The `$option` parameter was added.
 * @since 4.7.0 The `$passed_default` parameter was added to distinguish between a `false` value and the default parameter value.
 *
 * @param mixed  $default The default value to return if the option does not exist
 *                        in the database.
 * @param string $option  Option name.
 * @param bool   $passed_default Was `get_option()` passed a default value?
 */
      return apply_filters( "default_option_{$option}", $default, $option, $passed_default );
    }

    $alloptions = wp_load_alloptions();

    if ( isset( $alloptions[$option] ) ) {
      $value = $alloptions[$option];
    } else {
      $value = wp_cache_get( $option, 'options' );

      if ( false === $value ) {
        $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) );

        // Has to be get_row instead of get_var because of funkiness with 0, false, null values
        if ( is_object( $row ) ) {
          $value = $row->option_value;
          wp_cache_add( $option, $value, 'options' );
        } else { // option does not exist, so we must cache its non-existence
          if ( ! is_array( $notoptions ) ) {
             $notoptions = array();
          }
          $notoptions[$option] = true;
          wp_cache_set( 'notoptions', $notoptions, 'options' );

          
/** This filter is documented in wp-includes/option.php */
          return apply_filters( "default_option_{$option}", $default, $option, $passed_default );
        }
      }
    }
  } else {
    $suppress = $wpdb->suppress_errors();
    $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) );
    $wpdb->suppress_errors( $suppress );
    if ( is_object( $row ) ) {
      $value = $row->option_value;
    } else {
      
/** This filter is documented in wp-includes/option.php */
      return apply_filters( "default_option_{$option}", $default, $option, $passed_default );
    }

[1] [2] Next »