refactor(php): 优化路径前缀移除逻辑以支持路径段匹配

- 修改 PlatformBase.php 中的 removeCommonPrefix 方法
- 使用 rtrim 移除路径分隔符后缀
- 将路径拆分为段进行比较而非逐字符比较
- 使用 implode 重新组合剩余路径段
- 添加新测试用例验证路径段匹配功能
- 修复相邻目录按字符前缀截断的问题

phpunit/src/Platform/PlatformTest.php

@@ -110,6 +110,15 @@ class PlatformTest extends TestCase
         $this->assertSame('src/app.php', $linux->removeCommonPrefix('/project', '/project/src/app.php'));
     }
 
+    public function testPlatformPathPrefixRemovalUsesPathSegments(): void
+    {
+        $windows = new Windows();
+        $linux = new Linux();
+
+        $this->assertSame('project2\src\app.php', $windows->removeCommonPrefix('C:\project', 'C:/project2/src/app.php'));
+        $this->assertSame('project2/src/app.php', $linux->removeCommonPrefix('/tmp/project', '/tmp/project2/src/app.php'));
+    }
+
     /**
      * 测试 Windows 子系统选项
      */

phpunit/src/PreprocessorTest.php

@@ -135,6 +135,15 @@ class PreprocessorTest extends TestCase
         $this->assertStringStartsWith($this->compiler->getBuildDir(), $result);
     }
 
+    public function testGetCppFileDoesNotTrimSiblingDirectoryByCharacterPrefix(): void
+    {
+        $this->setProperty('buildDir', '/tmp/project/build');
+
+        $result = $this->compiler->getCppFile('/tmp/project2/src/app.php');
+
+        $this->assertSame('/tmp/project/build/project2/src/app.cc', $result);
+    }
+
     public function testGetCppFileDotPhpReplaced(): void
     {
         $phpFile = '/tmp/test_file.php';

src/Php/Platform/PlatformBase.php

@@ -154,18 +154,22 @@ abstract class PlatformBase
             $long = str_replace('/', '\\', $long);
         }
 
-        $len = min(strlen($short), strlen($long));
+        $short = rtrim($short, $separator);
+        $long = rtrim($long, $separator);
+        $shortParts = explode($separator, $short);
+        $longParts = explode($separator, $long);
         $prefixLen = 0;
+        $len = min(count($shortParts), count($longParts));
 
         for ($i = 0; $i < $len; $i++) {
-            if ($short[$i] === $long[$i]) {
+            if ($shortParts[$i] === $longParts[$i]) {
                 $prefixLen++;
             } else {
                 break;
             }
         }
 
-        return ltrim(substr($long, $prefixLen), $separator);
+        return implode($separator, array_slice($longParts, $prefixLen));
     }
 
     /**