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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 |
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158 | * Filters the post thumbnail size. |
159 | * |
160 | * @since 2.9.0 |
161 | * @since 4.9.0 Added the `$post_id` parameter. |
162 | * |
163 | * @param string|int[] $size Requested image size. Can be any registered image size name, or |
164 | * an array of width and height values in pixels (in that order). |
165 | * @param int $post_id The post ID. |
166 | */ |
167 | $size = apply_filters( 'post_thumbnail_size', $size, $post->ID ); |
168 |
|
169 | if ( $post_thumbnail_id ) { |
170 |
|
171 | /** |
172 | * Fires before fetching the post thumbnail HTML. |
173 | * |
174 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
175 | * |
176 | * @since 2.9.0 |