[Resolved] can’t cover generate_post_image via function.php

[Yuanzao]

Hi,There

I want to cover the generate_post_image function from /inc/structure/featured-images.php in child theme function.php

because I want to use custom field image url to be my future images.

Please help, Thanks!

[Yuanzao]

I tried this code but it didn’t work

add_action( 'wp','generate_remove_post_image', 20 );
function generate_remove_post_image() {
    remove_action( 'generate_after_entry_header', 'generate_post_image' );
}

add_action( 'generate_after_entry_header', 'hoh_generate_blog_post_image' );
function hoh_generate_blog_post_image() {
    
}

[David]

Hi there,

this hook to remove it:

add_action( 'after_setup_theme', function() {
    remove_action( 'generate_after_entry_header', 'generate_post_image' );
} );

[Yuanzao]

Hi, David

Thanks for the help.

I tried the code, it doesn’t work.

Here’s what I did in customize theme

https://imgur.com/bkMZK3h

What I expected is writing a new function in function.php to override the generate_post_image function from featured-images.php

So I can use the customize theme setting but custom field url image.

Thanks!

[Yuanzao]

Right now I made change on generate_post_image function in featured-images.php

it works, but I would like to move the code to child theme function.php so it won’t bother me for updating.

[David]

Can you share the code you added/changed so i can understand what its doing.

[Yuanzao]

Hi, David

Here’s what I modified in featured-images.php (in /inc/structure/ folder)

I would like to move the changed code to function.php so it won’t bother me for updating.

if ( ! function_exists( 'generate_post_image' ) ) {
	add_action( 'generate_after_entry_header', 'generate_post_image' );
	/**
	 * Prints the Post Image to post excerpts
	 */
	function generate_post_image() {
		// If there's no featured image, return.

		$custom_field_image_url = get_post_meta(get_the_ID(), 'cover_image_url', TRUE);

		if ( ! has_post_thumbnail() AND ! $custom_field_image_url) {
			return;
		}

		// If we're not on any single post/page or the 404 template, we must be showing excerpts.
		if ( ! is_singular() && ! is_404() ) {

			$attrs = array();

			if ( 'microdata' === generate_get_schema_type() ) {
				$attrs = array(
					'itemprop' => 'image',
				);
			}

			if( has_post_thumbnail() )
			{
				echo apply_filters( // phpcs:ignore
					'generate_featured_image_output',
					sprintf(
						'<div class="post-image">
							%3$s
							<a href="%1$s">
								%2$s
							</a>
						</div>',
						esc_url( get_permalink() ),
						get_the_post_thumbnail(
							get_the_ID(),
							apply_filters( 'generate_page_header_default_size', 'full' ),
							$attrs
						),
						apply_filters( 'generate_inside_featured_image_output', '' )
					)
				);
			}

			if($custom_field_image_url and !has_post_thumbnail())
			{
				echo apply_filters( // phpcs:ignore
					'generate_featured_image_output',
					sprintf(
						'<div class="post-image">
							%3$s
							<a href="%1$s">
								<img src="%2$s" loading="lazy" itemprop="image" width="300" height="204" />
							</a>
						</div>',
						esc_url( get_permalink() ),
						$custom_field_image_url,
						apply_filters( 'generate_inside_featured_image_output', '' )
					)
				);
			}

			
		}
	}
}

[David]

Aah ok – now i understand ( having a brain freeze today ).

You can just use the generate_featured_image_output filter in your functions.php

Heres an example of that being used with a conditional:

https://generatepress.com/forums/topic/if-there-is-no-featured-image/#post-1467706

[Yuanzao]

Hi, David

Thanks for the notice.

Actually I tried this filter “generate_featured_image_output”

However you can see it only output when the post has thumbnail.

I am using custom field url for replacing the thumbnail, so it won’t even output the html because it’s under “has_post_thumbnail”

if( has_post_thumbnail() )
			{
				echo apply_filters( // phpcs:ignore
					'generate_featured_image_output',
					sprintf(
						'<div class="post-image">
							%3$s
							<a href="%1$s">
								%2$s
							</a>
						</div>',
						esc_url( get_permalink() ),
						get_the_post_thumbnail(
							get_the_ID(),
							apply_filters( 'generate_page_header_default_size', 'full' ),
							$attrs
						),
						apply_filters( 'generate_inside_featured_image_output', '' )
					)
				);
			}

[Tom]

Hi there,

has_post_thumbnail() has a filter itself, so we can tell WP you have a post thumbnail if the custom field exists: https://developer.wordpress.org/reference/functions/has_post_thumbnail/

add_filter( 'has_post_thumbnail', function( $has, $post ) {
    $custom_field_image_url = get_post_meta( $post, 'cover_image_url', TRUE);

    if ( $custom_field_image_url ) {
        $has = true;
    }

    return $has;
}, 10, 2 );

[Yuanzao]

Great, Tom

Thanks a lot!

[Tom]

You’re welcome 🙂

[Author]

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