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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 |
|---|---|
| 120 | * Filters the returned ID of an uploaded attachment. |
| 121 | * |
| 122 | * The dynamic portion of the hook name, `$type`, refers to the attachment type, |
| 123 | * such as 'image', 'audio', 'video', 'file', etc. |
| 124 | * |
| 125 | * @since 2.5.0 |
| 126 | * |
| 127 | * @param int $id Uploaded attachment ID. |
| 128 | */ |
| 129 | echo apply_filters( "async_upload_{$type}", $id ); |
| 130 | } |
| 131 | |