custom-modern-theme/functions.php

<?php

// Exit if accessed directly.
defined( 'ABSPATH' ) || exit;

// Load child theme setup first.
require_once trailingslashit( get_stylesheet_directory() ) . 'setup.php';

/**
 * IMPORTANT:
 * Do not remove the code above!
 * Put your custom PHP code below.
 *
 * Child theme functionality:
 */

/**
 * Enqueuing stylesheet file to editor.
 *
 * Remove this when not needed.
 */
add_action( 'init', function() {

	// Add `style.css` file to editor.
	add_editor_style(
		esc_url_raw(
			add_query_arg(
				'ver',
				'v' . WebManDesign\Child_Theme\Setup::$stylesheet_filemtime,
				get_stylesheet_uri()
			)
		)
	);
}, 99 );


// Cutoms Post Type 'Projekte'
// Made by Lino and Flo

function create_project_post_type() {
  $labels = array(
    'name'               => __( 'Projekte' ),
    'singular_name'      => __( 'Projekt' ),
    'add_new'            => __( 'Neues Projekt hinzufügen' ),
    'add_new_item'       => __( 'Neues Projekt hinzufügen' ),
    'edit_item'          => __( 'Projekt bearbeiten' ),
    'new_item'           => __( 'Neues Projekt' ),
    'view_item'          => __( 'Projekt anzeigen' ),
    'search_items'       => __( 'Projekte durchsuchen' ),
    'not_found'          => __( 'Keine Projekte gefunden' ),
    'not_found_in_trash' => __( 'Keine Projekte im Papierkorb gefunden' ),
  );

  $args = array(
    'labels'             => $labels,
    'public'             => true,
    'has_archive'        => true,
    'menu_icon'          => 'dashicons-portfolio',
    'supports'           => array( 'title', 'editor', 'thumbnail', 'custom-fields' ),
    /*'taxonomies'         => array( 'category', 'post_tag' ),*/
	/*commented the line above to disable categorys and post tags. Uncomment this line if indeed needed to have tags or categories*/
    'rewrite'            => array( 'slug' => 'projekte' ),
    'show_in_menu'       => true,
    'show_in_nav_menus'  => true,
  );

  register_post_type( 'projekte', $args );

}

add_action( 'init', 'create_project_post_type' );

function add_project_meta_boxes() {
  add_meta_box(
    'project_details',
    __( 'Projekt Details' ),
    'project_details_callback',
    'projekte',
    'normal',
    'default'
  );
}
add_action( 'add_meta_boxes_projekte', 'add_project_meta_boxes' );

function project_details_callback( $post ) {
  wp_nonce_field( 'project_details', 'project_details_nonce' );
  $projekt_name = get_post_meta( $post->ID, '_projekt_name', true);
  $projekt_website = get_post_meta( $post->ID, '_projekt_website', true );
  $projekt_description = get_post_meta( $post->ID, '_projekt_description', true );
  $projekt_since = get_post_meta( $post->ID, '_projekt_since', true );
  $projekt_links = get_post_meta( $post->ID, '_projekt_links', true);

  ?>
  <p>
    <label for="projekt_name"><?php _e( 'Name' ); ?></label>
    <input type="text" name="projekt_name" id="projekt_name" value="<?php echo esc_attr( $projekt_name ); ?>">
  </p>
  <p>
    <label for="projekt_website"><?php _e( 'Website' ); ?></label>
    <input type="url" name="projekt_website" id="projekt_website" value="<?php echo esc_attr( $projekt_website ); ?>">
  </p>
  <p>
    <label for="projekt_description"><?php _e( 'Beschreibung' ); ?></label>
    <textarea name="projekt_description" id="projekt_description"><?php echo esc_textarea( $projekt_description ); ?></textarea>
  </p>
  <p>
    <label for="projekt_links"><?php _e( 'Weiterer Beschreibungstext' ); ?></label>
    <textarea name="projekt_links" id="projekt_links"><?php echo esc_textarea( $projekt_links ); ?></textarea>
  </p>
  <p>
    <label for="projekt_since"><?php _e( 'Dabei seit' ); ?></label>
    <input type="date" name="projekt_since" id="projekt_since" value="<?php echo esc_attr( $projekt_since ); ?>">
  </p>
    
    <?php

}


function save_project_meta( $post_id ) {
  if ( ! isset( $_POST['project_details_nonce'] ) || ! wp_verify_nonce( $_POST['project_details_nonce'], 'project_details' ) ) {
    return;
  }

  if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
    return;
  }

  if ( isset( $_POST['post_type'] ) && 'projekte' == $_POST['post_type'] ) {
    if ( current_user_can( 'edit_post', $post_id ) ) {
      if ( isset( $_POST['projekt_name'] ) ) {
        update_post_meta( $post_id, '_projekt_name', sanitize_text_field( $_POST['projekt_name'] ) );
      }
      if ( isset( $_POST['projekt_website'] ) ) {
        update_post_meta( $post_id, '_projekt_website', sanitize_text_field( $_POST['projekt_website'] ) );
      }
      if ( isset( $_POST['projekt_description'] ) ) {
        update_post_meta( $post_id, '_projekt_description', sanitize_textarea_field( $_POST['projekt_description'] ) );
      }
      if ( isset( $_POST['projekt_links'] ) ) {
        update_post_meta( $post_id, '_projekt_links', sanitize_textarea_field( $_POST['projekt_links'] ) );
      }
      if ( isset( $_POST['projekt_since'] ) ) {
        update_post_meta( $post_id, '_projekt_since', sanitize_text_field( $_POST['projekt_since'] ) );
      }
      /*
      if ( isset( $_POST['projekt_image'] ) ) {
        update_post_meta( $post_id, '_image_id', $_POST['upload_image_id'] );
      //  update_post_meta( $post_id, '_projekt_image', sanitize_text_field( $_POST['projekt_image'] ) );
      }*/
    }
  }
}
add_action( 'save_post_projekte', 'save_project_meta' );

/*Dieser Code Abschnitt deaktiviert den Editor (und die Felder für categories, tags und custom-fields) fuer den Custom Post Type "Projekte"*/
add_action( 'init', 'remove_editor_init' );
function remove_editor_init() {
    remove_post_type_support( 'projekte', 'editor' );
    remove_post_type_support( 'projekte', 'categories' );
    remove_post_type_support( 'projekte', 'tags' );
    remove_post_type_support( 'projekte', 'custom-fields' );
}

/*Dieser Code Abschnitt disabled das featured Image als Hintergrund*/
/*
add_action('wp_enqueue_scripts', 'custom_post_type_css');

function custom_post_type_css() {
    if (is_singular('Projekte')) {
        wp_enqueue_style('custom-post-type-projekte-css', get_stylesheet_directory_uri() . '/custom-post-type-projekte.css');
    }
}

// oder: 

add_action('after_setup_theme', 'custom_theme_setup');
function custom_theme_setup() {
  add_theme_support('post-thumbnails');
  add_image_size('custom_image_size', 10, 5, true); // Replace with your desired dimensions
}*/

/*
add_action('after_setup_theme', 'disable_featured_image');
function disable_featured_image() {
    remove_theme_support('post-thumbnails', 'Projekte');
}*/