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adding a class to image attachment

  • Hi All,

    I want to add a classname to the image that I am getting with wp_get_attachment_image

    I use the standard ACF snippet like so:

    $image = get_field('image');
    $size = 'full'; // (thumbnail, medium, large, full or custom size)
    if( $image ) {
        echo wp_get_attachment_image( $image, $size );
    }

    Now I want to add a classname like so:

    $image = get_field('card1_image');
    	$size = 'full'; // (thumbnail, medium, large, full or custom size)
    	$class='rounded-top'
    	if( $image ) {
    		echo wp_get_attachment_image( $image, $size, array ('class' => 'rounded-top' ) );
    	}

    But no class is given to the image.
    What am I doing wrong?
    Thanks.

  • Ah, I mixed things up.

    This is what I have now:
    
    $image = get_field('card1_image');
    	$size = 'full'; // (thumbnail, medium, large, full or custom size)
    	if( $image ) {
    		echo wp_get_attachment_image( $image, $size, array ('class' => 'rounded-top' ) );
    	}

    and that does not seem to work…

  • Looking at your code and the code for the WP function I only see one thing that could be causing this.

    https://developer.wordpress.org/reference/functions/wp_get_attachment_image/

    Question: is the class populated with anything?

    Possibly there is a filter on ‘wp_get_attachment_image_attributes’

  • Hi John,

    Question: is the class populated with anything?

    I use the class in other places on the site if that is what you mean?

    Possibly there is a filter on ‘wp_get_attachment_image_attributes

    mmhh, I looked for something like that but could not find anything. Are you saying the code is correct and should work?

    I use <?php the_post_thumbnail('large', array('class' => 'rounded-top')); ?> in other places on the site and that works. My rounded-top class is added to the wp-post-image class.

    I tried using

    $image = get_field('card1_image');
    	$size = 'full'; // (thumbnail, medium, large, full or custom size)
    	if( $image ) {
    		echo wp_get_attachment_image( $image, $size, array ('class' => 'rounded-top' ) );
    	}

    In twenty-ten and it does not work either. The only classes I see is attachment-full size-full In the ACF field settings I use the “ID” since I want the srcset thing.

    Thanks

  • OK Found it.

    As per the Code reference, the function uses four values:

    wp_get_attachment_image( int $attachment_id, string|array $size = 'thumbnail', bool $icon = false, string|array $attr = '' )

    Where I use only three. If I add the fourth value like so:

    echo wp_get_attachment_image($image, $size, "",array('class' => 'rounded-top') );

    It works. So problem solved.

    What makes it hard to spot the fault is that WP seems to use four values where in this case the four values seem required?

    Anyway, thanks for looking into this and pointing me toward the code reference.

  • sorry, duh on my part, I completely missed the fact that you didn’t have the right number of arguments in your call.

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