Options, Meta APIs: Ensure duplicate salts are properly flagged.

Improvements were made in 6.7 to ensure that salts stored in the database were primed more efficiently.

The logic added to accomplish this suffered from an edge case where array indexes were unexpectedly missing when `wp_salt()` was called recursively.

Follow up to [58837].

Props juliobox, ankitkumarshah, dilipbheda, johnbillion, joemcgill, desrosj.
Fixes #62424.

git-svn-id: https://develop.svn.wordpress.org/trunk@59427 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/pluggable.php

@@ -2479,16 +2479,7 @@ function wp_salt( $scheme = 'auth' ) {
 
 		static $duplicated_keys;
 		if ( null === $duplicated_keys ) {
-			$duplicated_keys = array(
-				'put your unique phrase here' => true,
-			);
-
-			/*
-			 * translators: This string should only be translated if wp-config-sample.php is localized.
-			 * You can check the localized release package or
-			 * https://i18n.svn.wordpress.org/<locale code>/branches/<wp version>/dist/wp-config-sample.php
-			 */
-			$duplicated_keys[ __( 'put your unique phrase here' ) ] = true;
+			$duplicated_keys = array();
 
 			foreach ( array( 'AUTH', 'SECURE_AUTH', 'LOGGED_IN', 'NONCE', 'SECRET' ) as $first ) {
 				foreach ( array( 'KEY', 'SALT' ) as $second ) {
@@ -2499,6 +2490,15 @@ function wp_salt( $scheme = 'auth' ) {
 					$duplicated_keys[ $value ] = isset( $duplicated_keys[ $value ] );
 				}
 			}
+
+			$duplicated_keys['put your unique phrase here'] = true;
+
+			/*
+			 * translators: This string should only be translated if wp-config-sample.php is localized.
+			 * You can check the localized release package or
+			 * https://i18n.svn.wordpress.org/<locale code>/branches/<wp version>/dist/wp-config-sample.php
+			 */
+			$duplicated_keys[ __( 'put your unique phrase here' ) ] = true;
 		}
 
 		/*