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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 |
|---|---|
| 148 | * Filters the post thumbnail size. |
| 149 | * |
| 150 | * @since 2.9.0 |
| 151 | * @since 4.9.0 Added the `$post_id` parameter. |
| 152 | * |
| 153 | * @param string|int[] $size Requested image size. Can be any registered image size name, or |
| 154 | * an array of width and height values in pixels (in that order). |
| 155 | * @param int $post_id The post ID. |
| 156 | */ |
| 157 | $size = apply_filters( 'post_thumbnail_size', $size, $post->ID ); |
| 158 | |
| 159 | if ( $post_thumbnail_id ) { |
| 160 | |
| 161 | /** |
| 162 | * Fires before fetching the post thumbnail HTML. |
| 163 | * |
| 164 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
| 165 | * |
| 166 | * @since 2.9.0 |