From 5af5cbb837cb1fc0ad9ba37d5a82b690010dedf3 Mon Sep 17 00:00:00 2001
From: NathanFreeman <1056159381@qq.com>
Date: Mon, 13 Jul 2026 22:26:29 +0800
Subject: [PATCH] =?UTF-8?q?=E5=9C=A8=E5=AD=97=E7=AC=A6=E4=B8=B2=E6=8B=BC?=
 =?UTF-8?q?=E6=8E=A5=E4=B8=AD=EF=BC=8C=E9=99=A4=E4=BA=86=E7=AC=AC=E4=B8=80?=
 =?UTF-8?q?=E4=B8=AA=E5=85=83=E7=B4=A0=E4=B9=8B=E5=A4=96=EF=BC=8C=E5=89=A9?=
 =?UTF-8?q?=E4=B8=8B=E7=9A=84=E5=AD=97=E7=AC=A6=E4=B8=B2=E5=A6=82=E6=9E=9C?=
 =?UTF-8?q?=E5=87=BA=E7=8E=B0=E7=A9=BA=E5=AD=97=E7=AC=A6=E4=B8=B2=EF=BC=8C?=
 =?UTF-8?q?=E5=BF=BD=E7=95=A5=E8=BF=99=E4=B8=AA=E5=AD=97=E7=AC=A6=E4=B8=B2?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/Parser/BinaryOpTrait.php     | 15 +++++++++++----
 tests/compiler/concat_empty.phpt | 12 ++++++++++++
 2 files changed, 23 insertions(+), 4 deletions(-)
 create mode 100644 tests/compiler/concat_empty.phpt

diff --git a/src/Parser/BinaryOpTrait.php b/src/Parser/BinaryOpTrait.php
index e57f987c..8d4d32b1 100644
--- a/src/Parser/BinaryOpTrait.php
+++ b/src/Parser/BinaryOpTrait.php
@@ -264,10 +264,17 @@ trait BinaryOpTrait
         $this->flattenConcatExpr($expr, $items);
 
         $argList = $prefixExpressions;
-        foreach ($items as $item) {
-            $type = $this->detectTypeOfExpr($item);
-            $parsed = $this->parseExprAsValue($item);
-            $argList[] = $this->prepareConcatOperand($parsed, $type);
+        foreach ($items as $index => $item) {
+            // 在字符串拼接中，除了第一个元素之外，剩下的字符串如果出现空字符串，忽略这个字符串
+            if ($index > 0 && $item->value == '') {
+                continue;
+            }
+
+            $argList[] = $this->prepareConcatOperand($this->parseExprAsValue($item), $this->detectTypeOfExpr($item));
+        }
+
+        if (sizeof($argList) == 1) {
+            return $argList[0];
         }
 
         return Symbol::concat() . '({' . implode(', ', $argList) . '})';
diff --git a/tests/compiler/concat_empty.phpt b/tests/compiler/concat_empty.phpt
new file mode 100644
index 00000000..d759d8e1
--- /dev/null
+++ b/tests/compiler/concat_empty.phpt
@@ -0,0 +1,12 @@
+--TEST--
+Concat empty strings
+--FILE--
+<?php
+function main() {
+    var_dump('' . 1 . '' . 'a' . '');
+    var_dump('' . 1);
+}
+?>
+--EXPECT--
+string(2) "1a"
+string(1) "1"