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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 |
|---|---|
| 4006 | $sized = image_downsize( $post_id, 'thumbnail' ); |
| 4007 | if ( $sized ) |
| 4008 | return $sized[0]; |
| 4009 | |
| 4010 | if ( !$thumb = wp_get_attachment_thumb_file( $post->ID ) ) |
| 4011 | return false; |
| 4012 | |
| 4013 | $url = str_replace(basename($url), basename($thumb), $url); |
| 4014 | |
| 4015 | return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID ); |
| 4016 | } |
| 4017 | |
| 4018 | /** |
| 4019 | * Check if the attachment is an image. |
| 4020 | * |
| 4021 | * @since 2.1.0 |
| 4022 | * |
| 4023 | * @param int $post_id Attachment ID |
| 4024 | * @return bool |