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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 |
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198 |
|
199 | /** |
200 | * Filter the attached file based on the given ID. |
201 | * |
202 | * @since 2.1.0 |
203 | * |
204 | * @param string $file Path to attached file. |
205 | * @param int $attachment_id Attachment ID. |
206 | */ |
207 | return apply_filters( 'get_attached_file', $file, $attachment_id ); |
208 | } |
209 |
|
210 | /** |
211 | * Update attachment file path based on attachment ID. |
212 | * |
213 | * Used to update the file path of the attachment, which uses post meta name |
214 | * '_wp_attached_file' to store the path of the attachment. |
215 | * |
216 | * @since 2.1.0 |