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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 |
|---|---|
| 6403 | if ( file_exists( $thumbfile ) ) { |
| 6404 | /** |
| 6405 | * Filters the attachment thumbnail file path. |
| 6406 | * |
| 6407 | * @since 2.1.0 |
| 6408 | * |
| 6409 | * @param string $thumbfile File path to the attachment thumbnail. |
| 6410 | * @param int $post_id Attachment ID. |
| 6411 | */ |
| 6412 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 6413 | } |
| 6414 | } |
| 6415 | return false; |
| 6416 | } |
| 6417 | |
| 6418 | /** |
| 6419 | * Retrieve URL for an attachment thumbnail. |
| 6420 | * |
| 6421 | * @since 2.1.0 |