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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 |
|---|---|
| 4950 | |
| 4951 | /** |
| 4952 | * Filter the attachment URL. |
| 4953 | * |
| 4954 | * @since 2.1.0 |
| 4955 | * |
| 4956 | * @param string $url URL for the given attachment. |
| 4957 | * @param int $post_id Attachment ID. |
| 4958 | */ |
| 4959 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
| 4960 | |
| 4961 | if ( empty( $url ) ) |
| 4962 | return false; |
| 4963 | |
| 4964 | return $url; |
| 4965 | } |
| 4966 | |
| 4967 | /** |
| 4968 | * Retrieve thumbnail for an attachment. |