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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 |
---|---|
5214 | if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) { |
5215 | /** |
5216 | * Filters the attachment thumbnail file path. |
5217 | * |
5218 | * @since 2.1.0 |
5219 | * |
5220 | * @param string $thumbfile File path to the attachment thumbnail. |
5221 | * @param int $post_id Attachment ID. |
5222 | */ |
5223 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
5224 | } |
5225 | return false; |
5226 | } |
5227 |
|
5228 | /** |
5229 | * Retrieve URL for an attachment thumbnail. |
5230 | * |
5231 | * @since 2.1.0 |
5232 | * |