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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 |
|---|---|
| 5011 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) { |
| 5012 | /** |
| 5013 | * Filters the attachment thumbnail file path. |
| 5014 | * |
| 5015 | * @since 2.1.0 |
| 5016 | * |
| 5017 | * @param string $thumbfile File path to the attachment thumbnail. |
| 5018 | * @param int $post_id Attachment ID. |
| 5019 | */ |
| 5020 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 5021 | } |
| 5022 | return false; |
| 5023 | } |
| 5024 | |
| 5025 | /** |
| 5026 | * Retrieve URL for an attachment thumbnail. |
| 5027 | * |
| 5028 | * @since 2.1.0 |
| 5029 | * |