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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 |
|---|---|
| 4235 | $post_id = (int) $post_id; |
| 4236 | if ( !$post = get_post( $post_id ) ) |
| 4237 | return false; |
| 4238 | if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) ) |
| 4239 | return false; |
| 4240 | |
| 4241 | $file = get_attached_file( $post->ID ); |
| 4242 | |
| 4243 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) |
| 4244 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 4245 | return false; |
| 4246 | } |
| 4247 | |
| 4248 | /** |
| 4249 | * Retrieve URL for an attachment thumbnail. |
| 4250 | * |
| 4251 | * @since 2.1.0 |
| 4252 | * |
| 4253 | * @param int $post_id Attachment ID |