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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 |
|---|---|
| 174 | * @since 2.9.0 |
| 175 | * |
| 176 | * @param string $html The post thumbnail HTML. |
| 177 | * @param int $post_id The post ID. |
| 178 | * @param string $post_thumbnail_id The post thumbnail ID. |
| 179 | * @param string|array $size The post thumbnail size. Image size or array of width and height |
| 180 | * values (in that order). Default 'post-thumbnail'. |
| 181 | * @param string $attr Query string of attributes. |
| 182 | */ |
| 183 | return apply_filters( 'post_thumbnail_html', $html, $post->ID, $post_thumbnail_id, $size, $attr ); |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Return the post thumbnail URL. |
| 188 | * |
| 189 | * @since 4.4.0 |
| 190 | * |
| 191 | * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`. |
| 192 | * @param string|array $size Optional. Registered image size to retrieve the source for or a flat |