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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 888 | $medium = str_replace( basename( $original ), 'midsize-' . basename( $original ), $original ); |
| 889 | if ( file_exists( $medium ) ) { |
| 890 | /** |
| 891 | * Filter the path of the file to delete. |
| 892 | * |
| 893 | * @since 2.1.0 |
| 894 | * |
| 895 | * @param string $medium Path to the file to delete. |
| 896 | */ |
| 897 | @unlink( apply_filters( 'wp_delete_file', $medium ) ); |
| 898 | } |
| 899 | |
| 900 | if ( empty( $_POST['create-new-attachment'] ) && empty( $_POST['skip-cropping'] ) ) { |
| 901 | /** This filter is documented in wp-admin/custom-header.php */ |
| 902 | @unlink( apply_filters( 'wp_delete_file', $original ) ); |
| 903 | } |
| 904 | |
| 905 | return $this->finished(); |
| 906 | } |
| 907 | |
| 908 | /** |
| 909 | * Display last step of custom header image page. |
| 910 | * |
| 911 | * @since 2.1.0 |