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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 |
|---|---|
| 108 | * Fires inside limited and specific upload-tab views in the legacy |
| 109 | * (pre-3.5.0) media popup. |
| 110 | * |
| 111 | * The dynamic portion of the hook name, `$tab`, refers to the specific |
| 112 | * media upload tab. Possible values include 'library' (Media Library), |
| 113 | * or any custom tab registered via the {@see 'media_upload_tabs'} filter. |
| 114 | * |
| 115 | * @since 2.5.0 |
| 116 | */ |
| 117 | do_action( "media_upload_{$tab}" ); |
| 118 | } |
| 119 | |
| 120 | |