[Support request] How to use if (is_single()) for Posts

[Marcus]

Hello, I use the following code for a function that should only be used on article pages / in post not on pages.

add_filter( 'the_content', 'mmx_maybe_add_copyright_to_content', 500);
 function mmx_maybe_add_copyright_to_content( $content ) {
		
		$copyright = array();
		
		/* thumbnail copyright */
$thumbnail_id = get_post_thumbnail_id();
$thumbnail_meta = array();
$thumbnail_meta_lizenz = array();
$thumbnail_meta[] = get_post_meta( $thumbnail_id, 'name', true ) ?? NULL;
$thumbnail_meta[] = get_post_meta( $thumbnail_id, 'organisation', true ) ?? NULL;
$thumbnail_meta_lizenz[] = get_post_meta( $thumbnail_id, 'lizenz', true ) ?? NULL;
$thumbnail_meta_lizenz[] = get_post_meta( $thumbnail_id, 'autor', true ) ?? NULL;
	
if (empty( count( array_filter ( $thumbnail_meta ) ) >= 1) )
 $copyright[] = '<div>&copy; ' . implode( ', ', $thumbnail_meta) . '</div>'; 

elseif (!empty( count( array_filter ( $thumbnail_meta_lizenz ) ) >= 1 ) )
 $copyright[] = '<div>&copy; ' . implode( ', ', $thumbnail_meta_lizenz) . '</div>';

elseif (!empty( count( array_filter ( $thumbnail_meta ) ) >= 1) )
 $copyright[] = '<div>&copy; ' . implode( ', ', $thumbnail_meta) . '</div>'; 

elseif (empty( count( array_filter ( $thumbnail_meta_lizenz ) ) >= 1 ) )
 $copyright[] = '<div>&copy; ' . implode( ', ', $thumbnail_meta_lizenz) . '</div>';

elseif (empty($thumbnail_meta) && (empty($thumbnail_meta_lizenz)))
	$copyright[] = '';

		
		/* in content images copyright */
		preg_match( '|<img.*?src=".*?/?>|', $content, $matches );
		foreach( $matches as $img ){
			preg_match( '|(src=")(.*?)"|', $img, $url);
			$attachment_id = attachment_url_to_postid( $url[2] );
			$attachment_meta = array();
			$attachment_meta_lizenz = array();
			$attachment_meta[] = get_post_meta( $attachment_id, 'name', true ) ?? NULL;
			$attachment_meta[] = get_post_meta( $attachment_id, 'organisation', true ) ?? NULL;
			$attachment_meta_lizenz[] = get_post_meta( $attachment_id, 'lizenz', true ) ?? NULL;
			$attachment_meta_lizenz[] = get_post_meta( $attachment_id, 'autor', true ) ?? NULL;
		
			if( count( array_filter ($attachment_meta) ) >= 1 ){
				$attachment_copyright = implode( ', ', $attachment_meta );
				$copyright[] = '<div>&copy; ' . $attachment_copyright . '</div>';				
			} elseif( count( array_filter ($attachment_meta_lizenz) ) >= 1 ){
				$attachment_copyright = implode( ', ', $attachment_meta_lizenz );
				$copyright[] = '<div>&copy; ' . $attachment_copyright . '</div>';			
			} else {
   				$copyright[] = '';
			}
		}
			

	
		$images_found = count( array_filter ( $copyright ) );
		if( $images_found >= 1 ){
			$copyright_list = '<div class="copyright">';
			$copyright_list .= $images_found === 1 ? 'Artikelbild' : 'Artikelbilder'; # @todo i18n gettext
			$copyright_list .= implode( '', $copyright );
			$copyright_list .= '</div><br />';
			$content .= $copyright_list;
		}
		
	return $content;
}

How do I adjust the code so that the output ‘Artikelfoto ©’ is only displayed on article pages / in posts but not in pages?

[David]

Hi there,

see this line:

function mmx_maybe_add_copyright_to_content( $content ) {

after it add a condition for your pages eg.

function mmx_maybe_add_copyright_to_content( $content ) {
    if ( is_page() ) {
        return $content;
    }

What this will do, at the top of the function it will check if is_page is true and if it is it will simply return original content.

[Marcus]

Hello David,

Thanks for your answer!

I tried it like this:

if (is_single()) {
	add_filter( 'the_content', 'mmx_maybe_add_copyright_to_content', 500);
	function mmx_maybe_add_copyright_to_content( $content ) {
		
		$copyright = array();

This prevents the display on pages, but also in articles / posts

Here a Screenshot with is_single

Here with the code as above

[Fernando]

Hi Marcus,

Did the suggestion by David not work?

This:

add_filter( 'the_content', 'mmx_maybe_add_copyright_to_content', 500);
 function mmx_maybe_add_copyright_to_content( $content ) {

if ( is_page() ) {
        return $content;
    }
		
		$copyright = array();
		
		/* thumbnail copyright */
$thumbnail_id = get_post_thumbnail_id();
$thumbnail_meta = array();
$thumbnail_meta_lizenz = array();
$thumbnail_meta[] = get_post_meta( $thumbnail_id, 'name', true ) ?? NULL;
$thumbnail_meta[] = get_post_meta( $thumbnail_id, 'organisation', true ) ?? NULL;
$thumbnail_meta_lizenz[] = get_post_meta( $thumbnail_id, 'lizenz', true ) ?? NULL;
$thumbnail_meta_lizenz[] = get_post_meta( $thumbnail_id, 'autor', true ) ?? NULL;
	
if (empty( count( array_filter ( $thumbnail_meta ) ) >= 1) )
 $copyright[] = '<div>&copy; ' . implode( ', ', $thumbnail_meta) . '</div>'; 

elseif (!empty( count( array_filter ( $thumbnail_meta_lizenz ) ) >= 1 ) )
 $copyright[] = '<div>&copy; ' . implode( ', ', $thumbnail_meta_lizenz) . '</div>';

elseif (!empty( count( array_filter ( $thumbnail_meta ) ) >= 1) )
 $copyright[] = '<div>&copy; ' . implode( ', ', $thumbnail_meta) . '</div>'; 

elseif (empty( count( array_filter ( $thumbnail_meta_lizenz ) ) >= 1 ) )
 $copyright[] = '<div>&copy; ' . implode( ', ', $thumbnail_meta_lizenz) . '</div>';

elseif (empty($thumbnail_meta) && (empty($thumbnail_meta_lizenz)))
	$copyright[] = '';

		
		/* in content images copyright */
		preg_match( '|<img.*?src=".*?/?>|', $content, $matches );
		foreach( $matches as $img ){
			preg_match( '|(src=")(.*?)"|', $img, $url);
			$attachment_id = attachment_url_to_postid( $url[2] );
			$attachment_meta = array();
			$attachment_meta_lizenz = array();
			$attachment_meta[] = get_post_meta( $attachment_id, 'name', true ) ?? NULL;
			$attachment_meta[] = get_post_meta( $attachment_id, 'organisation', true ) ?? NULL;
			$attachment_meta_lizenz[] = get_post_meta( $attachment_id, 'lizenz', true ) ?? NULL;
			$attachment_meta_lizenz[] = get_post_meta( $attachment_id, 'autor', true ) ?? NULL;
		
			if( count( array_filter ($attachment_meta) ) >= 1 ){
				$attachment_copyright = implode( ', ', $attachment_meta );
				$copyright[] = '<div>&copy; ' . $attachment_copyright . '</div>';				
			} elseif( count( array_filter ($attachment_meta_lizenz) ) >= 1 ){
				$attachment_copyright = implode( ', ', $attachment_meta_lizenz );
				$copyright[] = '<div>&copy; ' . $attachment_copyright . '</div>';			
			} else {
   				$copyright[] = '';
			}
		}
			

	
		$images_found = count( array_filter ( $copyright ) );
		if( $images_found >= 1 ){
			$copyright_list = '<div class="copyright">';
			$copyright_list .= $images_found === 1 ? 'Artikelbild' : 'Artikelbilder'; # @todo i18n gettext
			$copyright_list .= implode( '', $copyright );
			$copyright_list .= '</div><br />';
			$content .= $copyright_list;
		}
		
	return $content;
}

[Marcus]

Hello,

somehow there was a white page when trying to try David’s version.

When I copied and pasted the code here in its entirety, it worked as intended.

thanks

[Fernando]

You’re welcome, Marcus!

[Author]

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