Cache API: Consistently pass the $expire value as an integer in cache functions.

Follow-up to [52700].

Props dilipbheda.
Fixes #63364.

git-svn-id: https://develop.svn.wordpress.org/trunk@60206 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/cache.php

@@ -62,7 +62,7 @@ function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
 function wp_cache_add_multiple( array $data, $group = '', $expire = 0 ) {
 	global $wp_object_cache;
 
-	return $wp_object_cache->add_multiple( $data, $group, $expire );
+	return $wp_object_cache->add_multiple( $data, $group, (int) $expire );
 }
 
 /**
@@ -129,7 +129,7 @@ function wp_cache_set( $key, $data, $group = '', $expire = 0 ) {
 function wp_cache_set_multiple( array $data, $group = '', $expire = 0 ) {
 	global $wp_object_cache;
 
-	return $wp_object_cache->set_multiple( $data, $group, $expire );
+	return $wp_object_cache->set_multiple( $data, $group, (int) $expire );
 }
 
 /**