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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 |
|---|---|
| 200 | * @since 2.9.0 |
| 201 | * |
| 202 | * @param string $html The post thumbnail HTML. |
| 203 | * @param int $post_id The post ID. |
| 204 | * @param int $post_thumbnail_id The post thumbnail ID. |
| 205 | * @param string|int[] $size Requested image size. Can be any registered image size name, or |
| 206 | * an array of width and height values in pixels (in that order). |
| 207 | * @param string $attr Query string of attributes. |
| 208 | */ |
| 209 | return apply_filters( 'post_thumbnail_html', $html, $post->ID, $post_thumbnail_id, $size, $attr ); |
| 210 | } |
| 211 | |
| 212 | /** |
| 213 | * Return the post thumbnail URL. |
| 214 | * |
| 215 | * @since 4.4.0 |
| 216 | * |
| 217 | * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`. |
| 218 | * @param string|int[] $size Optional. Registered image size to retrieve the source for or a flat array |