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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 |
---|---|
4348 | if ( file_exists( $thumbfile ) ) { |
4349 | /** |
4350 | * Filters the attachment thumbnail file path. |
4351 | * |
4352 | * @since 2.1.0 |
4353 | * |
4354 | * @param string $thumbfile File path to the attachment thumbnail. |
4355 | * @param int $post_id Attachment ID. |
4356 | */ |
4357 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
4358 | } |
4359 | } |
4360 |
|
4361 | return false; |
4362 | } |
4363 |
|
4364 | /** |
4365 | * Gets the path to a translation file for loading a textdomain just in time. |
4366 | * |