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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 |
|---|---|
| 4367 | if ( file_exists( $thumbfile ) ) { |
| 4368 | /** |
| 4369 | * Filters the attachment thumbnail file path. |
| 4370 | * |
| 4371 | * @since 2.1.0 |
| 4372 | * |
| 4373 | * @param string $thumbfile File path to the attachment thumbnail. |
| 4374 | * @param int $post_id Attachment ID. |
| 4375 | */ |
| 4376 | return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID ); |
| 4377 | } |
| 4378 | } |
| 4379 | |
| 4380 | return false; |
| 4381 | } |
| 4382 | |
| 4383 | /** |
| 4384 | * Gets the path to a translation file for loading a textdomain just in time. |
| 4385 | * |