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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 |
|---|---|
| 4354 | $sized = image_downsize( $post_id, 'thumbnail' ); |
| 4355 | if ( $sized ) |
| 4356 | return $sized[0]; |
| 4357 | |
| 4358 | if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) ) |
| 4359 | return false; |
| 4360 | |
| 4361 | $url = str_replace(basename($url), basename($thumb), $url); |
| 4362 | |
| 4363 | return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID ); |
| 4364 | } |
| 4365 | |
| 4366 | /** |
| 4367 | * Check if the attachment is an image. |
| 4368 | * |
| 4369 | * @since 2.1.0 |
| 4370 | * |
| 4371 | * @param int $post_id Attachment ID |
| 4372 | * @return bool |