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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 | * media upload type. Possible values include 'image', 'audio', 'video', |
| 91 | * 'file', etc. |
| 92 | * |
| 93 | * The hook only fires if the current `$tab` is 'type' (From Computer), |
| 94 | * 'type_url' (From URL), or, if the tab does not exist (i.e., has not |
| 95 | * been registered via the {@see 'media_upload_tabs'} filter. |
| 96 | * |
| 97 | * @since 2.5.0 |
| 98 | */ |
| 99 | do_action( "media_upload_{$type}" ); |
| 100 | } else { |
| 101 | /** |
| 102 | * Fires inside limited and specific upload-tab views in the legacy |
| 103 | * (pre-3.5.0) media popup. |
| 104 | * |
| 105 | * The dynamic portion of the hook name, `$tab`, refers to the specific |
| 106 | * media upload tab. Possible values include 'library' (Media Library), |
| 107 | * or any custom tab registered via the {@see 'media_upload_tabs'} filter. |
| 108 | * |