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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 |
---|---|
5068 |
|
5069 | /** |
5070 | * Filters the attachment URL. |
5071 | * |
5072 | * @since 2.1.0 |
5073 | * |
5074 | * @param string $url URL for the given attachment. |
5075 | * @param int $post_id Attachment ID. |
5076 | */ |
5077 | $url = apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
5078 |
|
5079 | if ( empty( $url ) ) |
5080 | return false; |
5081 |
|
5082 | return $url; |
5083 | } |
5084 |
|
5085 | /** |
5086 | * Retrieves the caption for an attachment. |