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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 |
|---|---|
| 793 | * Reference to a single element from `$_FILES`. |
| 794 | * |
| 795 | * @type string $name The original name of the file on the client machine. |
| 796 | * @type string $type The mime type of the file, if the browser provided this information. |
| 797 | * @type string $tmp_name The temporary filename of the file in which the uploaded file was stored on the server. |
| 798 | * @type int $size The size, in bytes, of the uploaded file. |
| 799 | * @type int $error The error code associated with this file upload. |
| 800 | * } |
| 801 | */ |
| 802 | $file = apply_filters( "{$action}_prefilter", $file ); |
| 803 | |
| 804 | /** |
| 805 | * Filters the override parameters for a file before it is uploaded to WordPress. |
| 806 | * |
| 807 | * The dynamic portion of the hook name, `$action`, refers to the post action. |
| 808 | * |
| 809 | * Possible hook names include: |
| 810 | * |
| 811 | * - `wp_handle_sideload_overrides` |