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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 |
---|---|
120 | * |
121 | * Provides "just in time" filtering of all filters in wp_get_attachment_image(). |
122 | * |
123 | * @since 2.9.0 |
124 | * |
125 | * @param string $post_id The post ID. |
126 | * @param string $post_thumbnail_id The post thumbnail ID. |
127 | * @param string $size The post thumbnail size. |
128 | */ |
129 | do_action( 'begin_fetch_post_thumbnail_html', $post_id, $post_thumbnail_id, $size ); |
130 | if ( in_the_loop() ) |
131 | update_post_thumbnail_cache(); |
132 | $html = wp_get_attachment_image( $post_thumbnail_id, $size, false, $attr ); |
133 |
|
134 | /** |
135 | * Fires after fetching the post thumbnail HTML. |
136 | * |
137 | * @since 2.9.0 |
138 | * |