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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 |
|---|---|
| 259 | * Filters the post thumbnail URL. |
| 260 | * |
| 261 | * @since 5.9.0 |
| 262 | * |
| 263 | * @param string|false $thumbnail_url Post thumbnail URL or false if the post does not exist. |
| 264 | * @param int|WP_Post|null $post Post ID or WP_Post object. Default is global `$post`. |
| 265 | * @param string|int[] $size Registered image size to retrieve the source for or a flat array |
| 266 | * of height and width dimensions. Default 'post-thumbnail'. |
| 267 | */ |
| 268 | return apply_filters( 'post_thumbnail_url', $thumbnail_url, $post, $size ); |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * Displays the post thumbnail URL. |
| 273 | * |
| 274 | * @since 4.4.0 |
| 275 | * |
| 276 | * @param string|int[] $size Optional. Image size to use. Accepts any valid image size, |
| 277 | * or an array of width and height values in pixels (in that order). |