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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 |
|---|---|
| 5021 | |
| 5022 | /** |
| 5023 | * Filter the attachment thumbnail URL. |
| 5024 | * |
| 5025 | * @since 2.1.0 |
| 5026 | * |
| 5027 | * @param string $url URL for the attachment thumbnail. |
| 5028 | * @param int $post_id Attachment ID. |
| 5029 | */ |
| 5030 | return apply_filters( 'wp_get_attachment_thumb_url', $url, $post->ID ); |
| 5031 | } |
| 5032 | |
| 5033 | /** |
| 5034 | * Check if the attachment is an image. |
| 5035 | * |
| 5036 | * @since 2.1.0 |
| 5037 | * |
| 5038 | * @param int $post_id Optional. Attachment ID. Default 0. |
| 5039 | * @return bool Whether the attachment is an image. |