From 0d0a06e78f38e7d50270929b6d9f4b36d215c3d0 Mon Sep 17 00:00:00 2001
From: ralila <>
Date: Mon, 15 Nov 2021 02:04:59 +0100
Subject: [PATCH] Avoid empty variable names instead of filtering them later

---
 src/Psalm/Internal/Analyzer/StatementsAnalyzer.php | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/Psalm/Internal/Analyzer/StatementsAnalyzer.php b/src/Psalm/Internal/Analyzer/StatementsAnalyzer.php
index 0e2a3b73f..2bcd65f94 100644
--- a/src/Psalm/Internal/Analyzer/StatementsAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/StatementsAnalyzer.php
@@ -61,6 +61,7 @@ use function strtolower;
 use function substr;
 use function trim;
 
+use const PREG_SPLIT_NO_EMPTY;
 use const STDERR;
 
 /**
@@ -382,12 +383,9 @@ class StatementsAnalyzer extends SourceAnalyzer
 
             if (isset($statements_analyzer->parsed_docblock->tags['psalm-trace'])) {
                 foreach ($statements_analyzer->parsed_docblock->tags['psalm-trace'] as $traced_variable_line) {
-                    $possible_traced_variable_names = preg_split('/(?:\s*,\s*|\s+)/', $traced_variable_line);
+                    $possible_traced_variable_names = preg_split('/(?:\s*,\s*|\s+)/', $traced_variable_line, -1, PREG_SPLIT_NO_EMPTY);
                     if ($possible_traced_variable_names) {
-                        $traced_variables = array_merge(
-                            $traced_variables,
-                            array_filter($possible_traced_variable_names)
-                        );
+                        $traced_variables = array_merge($traced_variables, $possible_traced_variable_names);
                     }
                 }
             }