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