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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 767 | /** |
| 768 | * Filter the list of attachment image attributes. |
| 769 | * |
| 770 | * @since 2.8.0 |
| 771 | * |
| 772 | * @param array $attr Attributes for the image markup. |
| 773 | * @param WP_Post $attachment Image attachment post. |
| 774 | * @param string|array $size Requested size. |
| 775 | */ |
| 776 | $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size ); |
| 777 | $attr = array_map( 'esc_attr', $attr ); |
| 778 | $html = rtrim("<img $hwstring"); |
| 779 | foreach ( $attr as $name => $value ) { |
| 780 | $html .= " $name=" . '"' . $value . '"'; |
| 781 | } |
| 782 | $html .= ' />'; |
| 783 | } |
| 784 | |
| 785 | return $html; |