laravel BadMethodCall() error while caliing for index in api - php

Question

the Ptag controller
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use Validator;
use App\Ptag;
use App\Http\Resources\PtagResource;
use Illuminate\Support\Facades\Auth;
use Illuminate\Http\Resources\Json\JsonResource;
use Illuminate\Validation\Rule;
class PtagController extends Controller
{
public function index(Request $request){
$query=Ptag::query();
return PtagResource::collection($query);
}
}
ptag resource
<?php
namespace App\Http\Resources;
use Illuminate\Http\Resources\Json\JsonResource;
class PtagResource extends JsonResource
{
/**
* Transform the resource into an array.
*
* #param \Illuminate\Http\Request $request
* #return array
*/
public function toArray($request)
{
return [
'id'=>$this->id,
'title'=>$this->title
// 'product'=>$this->product()
];
}
}
ptag model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Ptag extends Model
{
protected $guarded=[];
public function product(){
return $this->belongsToMany('App\Product');
}
}
error is shown as such
ErrorException: array_key_exists(): Using array_key_exists() on objects is deprecated. Use isset() or property_exists() instead in file /home/rajesh/project/handicom/vendor/laravel/framework/src/Illuminate/Http/Resources/DelegatesToResource.php on line 53

Answer 1

Problem:
In DelegatesToResource.php file of vendor folder, we have the following code:
public function offsetExists($offset)
{
return array_key_exists($offset, $this->resource);
}
https://github.com/laravel/framework/blob/5.7/src/Illuminate/Http/Resources/DelegatesToResource.php
array_key_exists function is deprecated on PHP 7.4.x. So, the error you met is related to PHP, not Laravel.
Solution:
Method 1: The easiest way is to downgrade your PHP version. Naturally, you still have to ensure the requirements of Laravel 5.7 (PHP >=7.1.3)
Method 2: You upgrade your project to higher version. To limit too many changes in your project, you could use version 5.8. In this version, the library no longer uses array_key_exists function.
public function offsetExists($offset)
{
return isset($this->resource[$offset]);
}
https://github.com/laravel/framework/blob/5.8/src/Illuminate/Http/Resources/DelegatesToResource.php