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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 |
---|---|
6002 |
|
6003 | /** |
6004 | * Filters the updated attachment meta data. |
6005 | * |
6006 | * @since 2.1.0 |
6007 | * |
6008 | * @param array $data Array of updated attachment meta data. |
6009 | * @param int $attachment_id Attachment post ID. |
6010 | */ |
6011 | $data = apply_filters( 'wp_update_attachment_metadata', $data, $post->ID ); |
6012 | if ( $data ) { |
6013 | return update_post_meta( $post->ID, '_wp_attachment_metadata', $data ); |
6014 | } else { |
6015 | return delete_post_meta( $post->ID, '_wp_attachment_metadata' ); |
6016 | } |
6017 | } |
6018 |
|
6019 | /** |
6020 | * Retrieve the URL for an attachment. |