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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 |
---|---|
6508 | if ( file_exists( $thumbfile ) ) { |
6509 | /** |
6510 | * Filters the attachment thumbnail file path. |
6511 | * |
6512 | * @since 2.1.0 |
6513 | * |
6514 | * @param string $thumbfile File path to the attachment thumbnail. |
6515 | * @param int $post_id Attachment ID. |
6516 | */ |
6517 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
6518 | } |
6519 | } |
6520 | return false; |
6521 | } |
6522 |
|
6523 | /** |
6524 | * Retrieve URL for an attachment thumbnail. |
6525 | * |
6526 | * @since 2.1.0 |