ci(windows): add workflow to test bcpowmod on Windows with PHP 8.4

Author: nanasess

.github/workflows/test-bcpowmod-windows.yml

@@ -0,0 +1,115 @@
+name: Test bcpowmod on Windows PHP 8.4
+
+on:
+  workflow_dispatch:
+  push:
+  pull_request:
+
+jobs:
+  test-bcpowmod:
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        php: ['8.4']
+        arch: ['x64', 'x86']
+
+    name: PHP ${{ matrix.php }} - ${{ matrix.arch }}
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Setup PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: ${{ matrix.php }}
+        extensions: bcmath
+        coverage: none
+        architecture: ${{ matrix.arch }}
+
+    - name: Display environment info
+      run: |
+        echo "=== System Information ==="
+        echo "OS: $env:OS"
+        echo "PROCESSOR_ARCHITECTURE: $env:PROCESSOR_ARCHITECTURE"
+        echo "PROCESSOR_ARCHITEW6432: $env:PROCESSOR_ARCHITEW6432"
+        echo ""
+        echo "=== PHP Information ==="
+        php -v
+        php -r "echo 'PHP_INT_SIZE: ' . PHP_INT_SIZE . ' (bytes)' . PHP_EOL;"
+        php -r "echo 'PHP_INT_MAX: ' . PHP_INT_MAX . PHP_EOL;"
+        php -r "echo 'Architecture: ' . php_uname('m') . PHP_EOL;"
+        php -r "echo 'bcmath extension: ' . (extension_loaded('bcmath') ? 'Loaded' : 'Not loaded') . PHP_EOL;"
+
+    - name: Test bcpowmod with PHP
+      run: |
+        echo "=== Testing bcpowmod('-9', '1024', '123') ==="
+        php -r "echo 'Result: ' . var_export(bcpowmod('-9', '1024', '123'), true) . PHP_EOL;"
+
+        # More detailed test
+        php -r "
+          \$result = bcpowmod('-9', '1024', '123');
+          echo 'bcpowmod result type: ' . gettype(\$result) . PHP_EOL;
+          echo 'bcpowmod result value: ' . \$result . PHP_EOL;
+          echo 'Expected value: 42' . PHP_EOL;
+          echo 'Test ' . (\$result === '42' ? 'PASSED' : 'FAILED') . PHP_EOL;
+        "
+
+    - name: Setup Python
+      uses: actions/setup-python@v4
+      with:
+        python-version: '3.x'
+        architecture: ${{ matrix.arch }}
+
+    - name: Test with Python for comparison
+      run: |
+        echo "=== Testing with Python ==="
+        python -c "import platform; print(f'Python version: {platform.python_version()}'); print(f'Python architecture: {platform.machine()}'); print(f'Python platform: {platform.platform()}'); print(); result = pow(-9, 1024, 123); print(f'Python pow(-9, 1024, 123) = {result}'); print(f'Expected value: 42'); print(f'Test {\"PASSED\" if result == 42 else \"FAILED\"}')"
+
+    - name: Compare results
+      run: |
+        echo "=== Summary ==="
+
+        $phpResult = php -r "echo bcpowmod('-9', '1024', '123');"
+        $pythonResult = python -c "print(pow(-9, 1024, 123))"
+
+        echo "PHP bcpowmod result: $phpResult"
+        echo "Python pow result: $pythonResult"
+        echo "Expected result: 42"
+
+        if ($phpResult -eq "42") {
+          echo "✅ PHP result is correct"
+        } else {
+          echo "❌ PHP result is incorrect (got $phpResult, expected 42)"
+        }
+
+        if ($pythonResult -eq "42") {
+          echo "✅ Python result is correct"
+        } else {
+          echo "❌ Python result is incorrect (got $pythonResult, expected 42)"
+        }
+
+        if ($phpResult -ne $pythonResult) {
+          echo "⚠️  PHP and Python results differ!"
+          echo "This suggests a platform-specific issue with PHP's bcmath extension"
+        }
+
+    - name: Additional debugging info
+      if: always()
+      run: |
+        echo "=== Additional Debug Information ==="
+
+        # Check if running on 32-bit or 64-bit
+        php -r "
+          echo 'Is 32-bit PHP: ' . (PHP_INT_SIZE === 4 ? 'Yes' : 'No') . PHP_EOL;
+          echo 'Is 64-bit PHP: ' . (PHP_INT_SIZE === 8 ? 'Yes' : 'No') . PHP_EOL;
+        "
+
+        # Test a few more cases
+        echo ""
+        echo "=== Testing other bcpowmod cases ==="
+        php -r "
+          echo 'bcpowmod(\"9\", \"1024\", \"123\") = ' . bcpowmod('9', '1024', '123') . PHP_EOL;
+          echo 'bcpowmod(\"-9\", \"2\", \"123\") = ' . bcpowmod('-9', '2', '123') . PHP_EOL;
+          echo 'bcpowmod(\"-9\", \"4\", \"123\") = ' . bcpowmod('-9', '4', '123') . PHP_EOL;
+        "