General: Ensure consistent type for integer properties of `WP_Post`, `WP_Term`, and `WP_User`.

Previously, these properties could be unexpectedly converted to strings in some contexts.

This applies to the following functions:

* `sanitize_post_field()`
* `sanitize_term_field()`
* `sanitize_user_field()`

and the following properties:

* `WP_Post::ID`
* `WP_Post::post_parent`
* `WP_Post::menu_order`
* `WP_Term::term_id`
* `WP_Term::term_taxonomy_id`
* `WP_Term::parent`
* `WP_Term::count`
* `WP_Term::term_group`
* `WP_User::ID`

Props grantmkin, SergeyBiryukov.
Fixes #53235. See #52995.
Built from https://develop.svn.wordpress.org/trunk@50935


git-svn-id: http://core.svn.wordpress.org/trunk@50544 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post.php

@@ -2633,6 +2633,11 @@ function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
 		}
 	}
 
+	// Restore the type for integer fields after esc_attr().
+	if ( in_array( $field, $int_fields, true ) ) {
+		$value = (int) $value;
+	}
+
 	return $value;
 }
 

wp-includes/taxonomy.php

@@ -1760,6 +1760,12 @@ function sanitize_term_field( $field, $value, $term_id, $taxonomy, $context ) {
 	} elseif ( 'js' === $context ) {
 		$value = esc_js( $value );
 	}
+
+	// Restore the type for integer fields after esc_attr().
+	if ( in_array( $field, $int_fields, true ) ) {
+		$value = (int) $value;
+	}
+
 	return $value;
 }
 

wp-includes/user.php

@@ -1530,6 +1530,12 @@ function sanitize_user_field( $field, $value, $user_id, $context ) {
 	} elseif ( 'js' === $context ) {
 		$value = esc_js( $value );
 	}
+
+	// Restore the type for integer fields after esc_attr().
+	if ( in_array( $field, $int_fields, true ) ) {
+		$value = (int) $value;
+	}
+
 	return $value;
 }
 

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-50934';
+$wp_version = '5.8-alpha-50935';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.