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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 |
|---|---|
| 819 | * Reference to a single element from `$_FILES`. |
| 820 | * |
| 821 | * @type string $name The original name of the file on the client machine. |
| 822 | * @type string $type The mime type of the file, if the browser provided this information. |
| 823 | * @type string $tmp_name The temporary filename of the file in which the uploaded file was stored on the server. |
| 824 | * @type int $size The size, in bytes, of the uploaded file. |
| 825 | * @type int $error The error code associated with this file upload. |
| 826 | * } |
| 827 | */ |
| 828 | $overrides = apply_filters( "{$action}_overrides", $overrides, $file ); |
| 829 | |
| 830 | // You may define your own function and pass the name in $overrides['upload_error_handler']. |
| 831 | $upload_error_handler = 'wp_handle_upload_error'; |
| 832 | if ( isset( $overrides['upload_error_handler'] ) ) { |
| 833 | $upload_error_handler = $overrides['upload_error_handler']; |
| 834 | } |
| 835 | |
| 836 | // You may have had one or more 'wp_handle_upload_prefilter' functions error out the file. Handle that gracefully. |
| 837 | if ( isset( $file['error'] ) && ! is_numeric( $file['error'] ) && $file['error'] ) { |