apply_filters( 'wp_get_attachment_image_attributes', string[] $attr, WP_Post $attachment, string|int[] $size )

Filters the list of attachment image attributes.

Contents

Parameters

$attr string[]
Array of attribute values for the image markup, keyed by attribute name.
See wp_get_attachment_image() .
More Arguments from wp_get_attachment_image( ... $attr ) Attributes for the image markup.
  • src string
    Image attachment URL.
  • class string
    CSS class name or space-separated list of classes.
    Default attachment-$size_class size-$size_class, where $size_class is the image size being requested.
  • alt string
    Image description for the alt attribute.
  • srcset string
    The 'srcset' attribute value.
  • sizes string
    The 'sizes' attribute value.
  • loading string|false
    The 'loading' attribute value. Passing a value of false will result in the attribute being omitted for the image.
    Defaults to 'lazy', depending on wp_lazy_loading_enabled() .
  • decoding string
    The 'decoding' attribute value. Possible values are 'async' (default), 'sync', or 'auto'. Passing false or an empty string will result in the attribute being omitted.
$attachment WP_Post
Image attachment post.
$size string|int[]
Requested image size. Can be any registered image size name, or an array of width and height values in pixels (in that order).

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Source

File: wp-includes/media.php. View all references 

$attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size );

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Changelog

Changelog
Version Description
2.8.0 Introduced.

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User Contributed Notes

  2. Skip to note 2 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 1You must log in to vote on the helpfulness of this note
    Contributed by Drew Jaynes —

    Add a data attribute to each <img> tag in a gallery
    Note: this filter runs inside wp_get_attachment_image(), which means your attribute will be added for all uses of the function.

    /**
 * Filter attributes for the current gallery image tag to add a 'data-full'
 * data attribute.
 *
 * @param array   $atts       Gallery image tag attributes.
 * @param WP_Post $attachment WP_Post object for the attachment.
 * @return array (maybe) filtered gallery image tag attributes.
 */
function wpdocs_filter_gallery_img_atts( $atts, $attachment ) {
	if ( $full_size = wp_get_attachment_image_src( $attachment->ID, 'full' ) ) {
		if ( ! empty( $full_size[0] ) ) {
			$atts['data-full'] = $full_size[0];
		}
	}
	return $atts;
}
add_filter( 'wp_get_attachment_image_attributes', 'wpdocs_filter_gallery_img_atts', 10, 2 );
  4. Skip to note 4 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 0You must log in to vote on the helpfulness of this note
    Contributed by akkis —

    You can add custom data attributes to image elements by adding this snippet on theme’s function.php:

        /**
     * Add custom data attribute to every image element
     */
    add_filter( 'wp_get_attachment_image_attributes', 'add_custom_image_data_attributes', 10, 3 );
    function add_custom_image_data_attributes( $attr, $attachment, $size ) {
        
        // Ensure that the <img> doesn't have the data attribute already
        if ( ! array_key_exists( 'data-custom', $attr ) ) {
            $attr['data-custom'] = 'dummy text';
        }

        return $attr;
    }

    Also, note that I use array_key_exists() PHP function instead of isset() because isset() does not return TRUE for array keys that correspond to a NULL value, while array_key_exists() does as of PHP Manual (http://php.net/manual/en/function.array-key-exists.php).

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