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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 |
|---|---|
| 911 | * Filters the list of attachment image attributes. |
| 912 | * |
| 913 | * @since 2.8.0 |
| 914 | * |
| 915 | * @param array $attr Attributes for the image markup. |
| 916 | * @param WP_Post $attachment Image attachment post. |
| 917 | * @param string|array $size Requested size. Image size or array of width and height values |
| 918 | * (in that order). Default 'thumbnail'. |
| 919 | */ |
| 920 | $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size ); |
| 921 | $attr = array_map( 'esc_attr', $attr ); |
| 922 | $html = rtrim( "<img $hwstring" ); |
| 923 | foreach ( $attr as $name => $value ) { |
| 924 | $html .= " $name=" . '"' . $value . '"'; |
| 925 | } |
| 926 | $html .= ' />'; |
| 927 | } |
| 928 | |
| 929 | return $html; |