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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 |
---|---|
5044 |
|
5045 | /** |
5046 | * Filter the attachment URL. |
5047 | * |
5048 | * @since 2.1.0 |
5049 | * |
5050 | * @param string $url URL for the given attachment. |
5051 | * @param int $post_id Attachment ID. |
5052 | */ |
5053 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
5054 |
|
5055 | if ( empty( $url ) ) |
5056 | return false; |
5057 |
|
5058 | return $url; |
5059 | } |
5060 |
|
5061 | /** |
5062 | * Retrieve thumbnail for an attachment. |