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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 |
|---|---|
| 5165 | |
| 5166 | /** |
| 5167 | * Filters the attachment thumbnail URL. |
| 5168 | * |
| 5169 | * @since 2.1.0 |
| 5170 | * |
| 5171 | * @param string $url URL for the attachment thumbnail. |
| 5172 | * @param int $post_id Attachment ID. |
| 5173 | */ |
| 5174 | return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID ); |
| 5175 | } |
| 5176 | |
| 5177 | /** |
| 5178 | * Verifies an attachment is of a given type. |
| 5179 | * |
| 5180 | * @since 4.2.0 |
| 5181 | * |
| 5182 | * @param string $type Attachment type. Accepts 'image', 'audio', or 'video'. |
| 5183 | * @param int|WP_Post $post Optional. Attachment ID or object. Default is global $post. |