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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 |
---|---|
2695 | } |
2696 | } |
2697 |
|
2698 | if ( empty($url) ) //If any of the above options failed, Fallback on the GUID as used pre-2.7, not recomended to rely upon this. |
2699 | $url = get_the_guid( $post->ID ); |
2700 |
|
2701 | if ( 'attachment' != $post->post_type || empty($url) ) |
2702 | return false; |
2703 |
|
2704 | return apply_filters( 'wp_get_attachment_url', $url, $post->ID ); |
2705 | } |
2706 |
|
2707 | /** |
2708 | * Retrieve thumbnail for an attachment. |
2709 | * |
2710 | * @since 2.1.0 |
2711 | * |
2712 | * @param int $post_id Attachment ID. |
2713 | * @return mixed False on failure. Thumbnail file path on success. |