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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 |
---|---|
138 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
139 | * |
140 | * @since 2.9.0 |
141 | * |
142 | * @param int $post_id The post ID. |
143 | * @param string $post_thumbnail_id The post thumbnail ID. |
144 | * @param string|array $size The post thumbnail size. Image size or array of width |
145 | * and height values (in that order). Default 'post-thumbnail'. |
146 | */ |
147 | do_action( 'begin_fetch_post_thumbnail_html', $post->ID, $post_thumbnail_id, $size ); |
148 | if ( in_the_loop() ) |
149 | update_post_thumbnail_cache(); |
150 | $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); |
151 |
|
152 | /** |
153 | * Fires after fetching the post thumbnail HTML. |
154 | * |
155 | * @since 2.9.0 |
156 | * |