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// Konkretes Beispiel: Alle <h2> in single posts werden über die Funktion span_headers replaced und es kommt <h2 class="yellow_highlight"><span> ... raus.

function fdp_highlight_headers ( $content ) {
	if ( is_single() ) {
		// $content = str_replace('Rico Apitz', 'Oliver Gehrmann', $content);
		return span_headers('h2', $content);
	}
	return $content;
}
add_filter( 'the_content', 'fdp_highlight_headers', 99);

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.hidden-row {
  height: 0;
  opacity: 0;
  padding: 0;
  position: absolute;
  transition: opacity 0s ease, padding 500ms ease, visibility ease 500ms;
  visibility: hidden;
}
.hidden-row:not(.active) {
  left: 50%;

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// Add JavaScript file 'my-script-filename.js' (located in the child theme directory /js) to WordPress (in the footer)
function add_my_own_scripts() {
	wp_register_script('my-script', get_stylesheet_directory_uri() . '/js/my-script-filename.js', '', '1.0', true);
	wp_enqueue_script('my-script');
}
add_action( 'wp_enqueue_scripts', 'add_my_own_scripts' );

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// Per Filter in der functions.php den max-Wert für die Bildauflösungen im Blog-Modul anpassen:

function nxt_overwrite_divi_cropping($width) {
	return 2600;
}
add_filter( 'et_pb_blog_image_width', 'nxt_overwrite_divi_cropping' );
add_filter( 'et_pb_blog_image_height', 'nxt_overwrite_divi_cropping' );

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/** Add polylang to Divi Library Window */
function cedura_pll_get_post_types($types) {
  return array_merge($types, ['et_pb_layout' => 'et_pb_layout']);
}
add_filter('pll_get_post_types', 'cedura_pll_get_post_types');

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// Add a Metabox to the backend
function frosted_add_custom_header_metabox() {
	add_meta_box("frosted-custom-header", "Hintergrundfarbe der Navigation", "frosted_custom_header", "page", "side", "high", null);
}
add_action("add_meta_boxes", "frosted_add_custom_header_metabox");

// Fill Metabox with our custom variable
function frosted_custom_header() {
	wp_nonce_field(basename(__FILE__), "frosted-custom-header-metabox-nonce");
	if(get_post_meta(get_the_ID(), '_frosted_header_selection', true) != '') {

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// Disables the block editor from managing widgets in the Gutenberg plugin.
add_filter( 'gutenberg_use_widgets_block_editor', '__return_false', 100 );
// Disables the block editor from managing widgets.
add_filter( 'use_widgets_block_editor', '__return_false' );

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// We are adding custom bulk actions in the WP Admin Backend for the post type "message"
function dc_custom_bulk_actions( $bulk_array ) {
	$message_status_fields = get_field_object('field_5f3ba86a9409e');
	// echo '<!-- nxt debug --><pre>'; print_r($message_status_fields); echo '</pre>';
	foreach($message_status_fields['choices'] as $status_option_key => $status_option_value) {
		$bulk_array[$status_option_key] = 'Set message status to ' . $status_option_key;
	}
	return $bulk_array;
}
add_filter( 'bulk_actions-edit-message', 'dc_custom_bulk_actions' );

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/**
 * Add more colums to the listing of messages in the backend
 */
function nxt_more_columns($columns) {
	$columns = [
		'cb'					=> '<input type="checkbox" />',
		'title' 				=> __('Title', 'nxt-acf-forms'),
		'cf_category'			=> __('Category', 'nxt-acf-forms'),
		'cf_email'				=> __('E-Mail', 'nxt-acf-forms'),
		'cf_tel'				=> __('Telephone', 'nxt-acf-forms'),

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/* For styling the rendered Markdown */
h1 { margin-top: 45px; }
ul + *, * + table { margin-top: 30px; }
hr { margin: 30px 0; }
ul li.md-checkbox label.checkbox-label-checked { text-decoration: line-through; }