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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 |
|---|---|
| 761 | * |
| 762 | * - `wp_handle_sideload_prefilter` |
| 763 | * - `wp_handle_upload_prefilter` |
| 764 | * |
| 765 | * @since 2.9.0 as 'wp_handle_upload_prefilter'. |
| 766 | * @since 4.0.0 Converted to a dynamic hook with `$action`. |
| 767 | * |
| 768 | * @param string[] $file An array of data for the file. Reference to a single element of `$_FILES`. |
| 769 | */ |
| 770 | $file = apply_filters( "{$action}_prefilter", $file ); |
| 771 | |
| 772 | /** |
| 773 | * Filters the override parameters for a file before it is uploaded to WordPress. |
| 774 | * |
| 775 | * The dynamic portion of the hook name, `$action`, refers to the post action. |
| 776 | * Possible filter names include: |
| 777 | * |
| 778 | * - `wp_handle_sideload_overrides` |
| 779 | * - `wp_handle_upload_overrides` |