Upload: Add a check in `wp_check_filetype_and_ext()` to account for CSV files having the `application/csv` MIME type.

Previously, the PHP Fileinfo extension used to detect CSV files as `text/plain`.

In PHP 8, this has changed, and CSV files are detected as `application/csv`.

Follow-up to [44438].

See #50913.
Built from https://develop.svn.wordpress.org/trunk@49049


git-svn-id: http://core.svn.wordpress.org/trunk@48811 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/functions.php

@@ -2933,6 +2933,7 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 				array(
 					'text/plain',
 					'text/csv',
+					'application/csv',
 					'text/richtext',
 					'text/tsv',
 					'text/vtt',
@@ -2943,6 +2944,21 @@ function wp_check_filetype_and_ext( $file, $filename, $mimes = null ) {
 				$type = false;
 				$ext  = false;
 			}
+		} elseif ( 'application/csv' === $real_mime ) {
+			// Special casing for CSV files.
+			if ( ! in_array(
+				$type,
+				array(
+					'text/csv',
+					'text/plain',
+					'application/csv',
+				),
+				true
+			)
+			) {
+				$type = false;
+				$ext  = false;
+			}
 		} elseif ( 'text/rtf' === $real_mime ) {
 			// Special casing for RTF files.
 			if ( ! in_array(

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.6-alpha-49048';
+$wp_version = '5.6-alpha-49049';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.