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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 |
|---|---|
| 5707 | if ( ! empty( $imagedata['thumb'] ) && ( $thumbfile = str_replace( basename( $file ), $imagedata['thumb'], $file ) ) && file_exists( $thumbfile ) ) { |
| 5708 | /** |
| 5709 | * Filters the attachment thumbnail file path. |
| 5710 | * |
| 5711 | * @since 2.1.0 |
| 5712 | * |
| 5713 | * @param string $thumbfile File path to the attachment thumbnail. |
| 5714 | * @param int $post_id Attachment ID. |
| 5715 | */ |
| 5716 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 5717 | } |
| 5718 | return false; |
| 5719 | } |
| 5720 | |
| 5721 | /** |
| 5722 | * Retrieve URL for an attachment thumbnail. |
| 5723 | * |
| 5724 | * @since 2.1.0 |
| 5725 | * |