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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 |
|---|---|
| 90 | * Fires inside limited and specific upload-tab views in the legacy |
| 91 | * (pre-3.5.0) media popup. |
| 92 | * |
| 93 | * The dynamic portion of the hook name, $tab, refers to the specific |
| 94 | * media upload tab. Possible values include 'library' (Media Library), |
| 95 | * or any custom tab registered via the 'media_upload_tabs' filter. |
| 96 | * |
| 97 | * @since 2.5.0 |
| 98 | */ |
| 99 | do_action( "media_upload_$tab" ); |
| 100 | } |
| 101 | |