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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 |
|---|---|
| 833 | * reporting will be completely skipped. |
| 834 | * |
| 835 | * @since 4.9.0 |
| 836 | * |
| 837 | * @param string $move_new_file If null (default) move the file after the upload. |
| 838 | * @param string $file An array of data for a single file. |
| 839 | * @param string $new_file Filename of the newly-uploaded file. |
| 840 | * @param string $type File type. |
| 841 | */ |
| 842 | $move_new_file = apply_filters( 'pre_move_uploaded_file', null, $file, $new_file, $type ); |
| 843 | |
| 844 | if ( null === $move_new_file ) { |
| 845 | if ( 'wp_handle_upload' === $action ) { |
| 846 | $move_new_file = @ move_uploaded_file( $file['tmp_name'], $new_file ); |
| 847 | } else { |
| 848 | // use copy and unlink because rename breaks streams. |
| 849 | $move_new_file = @ copy( $file['tmp_name'], $new_file ); |
| 850 | unlink( $file['tmp_name'] ); |
| 851 | } |