{
  "id": "php/class-not-final-extends",
  "signature": "Fatal error: Uncaught Error: Cannot use 'App\\Models\\User' as a trait in /var/www/app/src/Models/Admin.php:10",
  "signature_zh": "致命错误: 未捕获的错误: 不能将 'App\\Models\\User' 用作 trait，位于 /var/www/app/src/Models/Admin.php:10",
  "regex": "Fatal error: Uncaught Error: Cannot use '.*' as a trait in .* on line \\d+",
  "domain": "php",
  "category": "type_error",
  "subcategory": null,
  "root_cause": "PHP's use statement is misinterpreted when a class name is used in a trait context, typically because the developer accidentally wrote 'use App\\Models\\User;' inside a class body instead of extending it, or the class is not declared as a trait.",
  "root_cause_type": "generic",
  "root_cause_zh": "PHP 的 use 语句被误解为 trait 上下文，通常是因为开发者在类体内错误地写了 'use App\\Models\\User;' 而不是继承它，或者该类未声明为 trait。",
  "versions": [
    {
      "version": "PHP 8.0",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "PHP 8.1",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "PHP 8.2",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "PHP 8.3",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Adding a 'use' statement at the top of the file for the class does not fix the error because the problem is the misuse of 'use' inside the class body to import a class, not a trait.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Renaming the class to a trait by adding 'trait User { }' works but changes the design incorrectly; the class should be extended with 'extends'.",
      "fail_rate": 0.6,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Replace 'use App\\Models\\User;' inside the class body with 'class Admin extends \\App\\Models\\User' to properly inherit from the class.",
      "success_rate": 0.95,
      "how": "Replace 'use App\\Models\\User;' inside the class body with 'class Admin extends \\App\\Models\\User' to properly inherit from the class.",
      "condition": "",
      "sources": []
    },
    {
      "action": "If the intent is to use a trait, ensure the source file defines a trait (e.g., 'trait User { }') and then use 'use User;' inside the class.",
      "success_rate": 0.9,
      "how": "If the intent is to use a trait, ensure the source file defines a trait (e.g., 'trait User { }') and then use 'use User;' inside the class.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Check for typos: verify that the class file at src/Models/User.php declares 'class User' not 'trait User' or 'interface User'.",
      "success_rate": 0.85,
      "how": "Check for typos: verify that the class file at src/Models/User.php declares 'class User' not 'trait User' or 'interface User'.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Replace 'use App\\Models\\User;' inside the class body with 'class Admin extends \\App\\Models\\User' to properly inherit from the class.",
    "If the intent is to use a trait, ensure the source file defines a trait (e.g., 'trait User { }') and then use 'use User;' inside the class.",
    "Check for typos: verify that the class file at src/Models/User.php declares 'class User' not 'trait User' or 'interface User'."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.php.net/manual/en/language.oop5.traits.php",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.83,
  "fix_success_rate": 0.95,
  "resolvable": "true",
  "first_seen": "2023-08-15",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}