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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 |
---|---|
4926 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) { |
4927 | /** |
4928 | * Filter the attachment thumbnail file path. |
4929 | * |
4930 | * @since 2.1.0 |
4931 | * |
4932 | * @param string $thumbfile File path to the attachment thumbnail. |
4933 | * @param int $post_id Attachment ID. |
4934 | */ |
4935 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
4936 | } |
4937 | return false; |
4938 | } |
4939 |
|
4940 | /** |
4941 | * Retrieve URL for an attachment thumbnail. |
4942 | * |
4943 | * @since 2.1.0 |
4944 | * |