diff --git a/src/wp-includes/load.php b/src/wp-includes/load.php
index 98c6d42a94..14f58bc104 100644
--- a/src/wp-includes/load.php
+++ b/src/wp-includes/load.php
@@ -1017,14 +1017,23 @@ function wp_is_ini_value_changeable( $setting ) {
 	static $ini_all;
 
 	if ( ! isset( $ini_all ) ) {
-		$ini_all = ini_get_all();
-	}
+		$ini_all = false;
+		// Sometimes `ini_get_all()` is disabled via the `disable_functions` option for "security purposes".
+		if ( function_exists( 'ini_get_all' ) ) {
+			$ini_all = ini_get_all();
+		}
+ 	}
 
 	// Bit operator to workaround https://bugs.php.net/bug.php?id=44936 which changes access level to 63 in PHP 5.2.6 - 5.2.17.
 	if ( isset( $ini_all[ $setting ]['access'] ) && ( INI_ALL === ( $ini_all[ $setting ]['access'] & 7 ) || INI_USER === ( $ini_all[ $setting ]['access'] & 7 ) ) ) {
 		return true;
 	}
 
+	// If we were unable to retrieve the details, fail gracefully to assume it's changeable.
+	if ( ! is_array( $ini_all ) ) {
+		return true;
+	}
+
 	return false;
 }