fix(const): 修复常量名与变量名冲突问题、常量名大小写敏感问题

src/Php/CompilerBase.php

@@ -143,6 +143,7 @@ class CompilerBase extends \PhpAot\Core\Translator
     public const string DYNAMIC_CALLED_CLASS = '__dynamic_called_class__';
     public const string STATIC_VAR = '_static_var_';
     public const string GLOBAL_VAR = '_global_var_';
+    public const string CONST_VAR = '_const_var_';
     public const string OBJECT_PROP = '_object_prop_';
     public const string CLASS_MAP = 'class_map';
     public const string FUNC_MAP = 'func_map';
@@ -5021,22 +5022,22 @@ class CompilerBase extends \PhpAot\Core\Translator
         $constInfo->type              = $this->detectStrValueType($value);
         $constInfo->namespace = $this->namespace;
         $constInfo->name = $name;
-        $this->constants[$this->escapeNamespace($name)] = $constInfo;
+        $this->constants[$this->escapeConstVar($name)] = $constInfo;
     }
 
     protected function hasConstant(string $name): bool
     {
-        return isset($this->constants[$this->escapeNamespace($name)]);
+        return isset($this->constants[$this->escapeConstVar($name)]);
     }
 
     protected function getConstant(string $name): string
     {
-        return $this->escapeNamespace($name);
+        return $this->escapeConstVar($name);
     }
 
     protected function getConstantType(string $name): string
     {
-        return $this->constants[$this->escapeNamespace($name)]->type;
+        return $this->constants[$this->escapeConstVar($name)]->type;
     }
 
     protected function detectStrValueType(mixed $constant): string

src/Php/Generator/Utils.php

@@ -95,6 +95,11 @@ trait Utils
         return self::GLOBAL_VAR . $name;
     }
 
+    protected function escapeConstVar(string $name): string
+    {
+        return self::CONST_VAR . str_replace('\\', self::NAMESPACE_SEPARATOR, $name);
+    }
+
     protected function escapeNamespace(string $ns): string
     {
         return str_replace('\\', self::NAMESPACE_SEPARATOR, strtolower($ns));

tests/aot/const/const-same-name.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Constant with the same name (case-insensitive) resolve independently
+--FILE--
+<?php
+const a = 123;
+const A = 456;
+
+function main(): void
+{
+    var_dump(a, A);
+}
+?>
+--EXPECT--
+int(123)
+int(456)

tests/aot/const/const-var-same-name.phpt

@@ -0,0 +1,15 @@
+--TEST--
+Constant and variable with the same name (case-insensitive) resolve independently
+--FILE--
+<?php
+const a = 123;
+
+function main(): void
+{
+    $a = 456;
+    var_dump(a, $a);
+}
+?>
+--EXPECT--
+int(123)
+int(456)