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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 |
---|---|
142 | * Filters the post thumbnail size. |
143 | * |
144 | * @since 2.9.0 |
145 | * @since 4.9.0 Added the `$post_id` parameter. |
146 | * |
147 | * @param string|array $size The post thumbnail size. Image size or array of width and height |
148 | * values (in that order). Default 'post-thumbnail'. |
149 | * @param int $post_id The post ID. |
150 | */ |
151 | $size = apply_filters( 'post_thumbnail_size', $size, $post->ID ); |
152 |
|
153 | if ( $post_thumbnail_id ) { |
154 |
|
155 | /** |
156 | * Fires before fetching the post thumbnail HTML. |
157 | * |
158 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
159 | * |
160 | * @since 2.9.0 |