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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 |
|---|---|
| 194 | |
| 195 | /** |
| 196 | * Filter the attached file based on the given ID. |
| 197 | * |
| 198 | * @since 2.1.0 |
| 199 | * |
| 200 | * @param string $file Path to attached file. |
| 201 | * @param int $attachment_id Attachment ID. |
| 202 | */ |
| 203 | return apply_filters( 'get_attached_file', $file, $attachment_id ); |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * Update attachment file path based on attachment ID. |
| 208 | * |
| 209 | * Used to update the file path of the attachment, which uses post meta name |
| 210 | * '_wp_attached_file' to store the path of the attachment. |
| 211 | * |
| 212 | * @since 2.1.0 |