尝试读取数组属性 "title"（错误异常）Laravel Php

Question

when I try to run the following it gives the Error Exception where it can't read the title on array. Can you let me know how to fix this?

**我的 post 来自 app/models 的代码，如下所示 **

 <?php


namespace App\Models;

use Illuminate\Database\Eloquent\ModelNotFoundException; //
use Illuminate\Support\Facades\File;

class Post
{   
    public $title;

    public $excerpt;

    public $date;
    
    public $body;

    public function __construct($title, $excerpt, $date, $body)
    {
        $this-> title = $title;              //this is where the error is occurring 
        $this-> excerpt = $excerpt;
        $this-> date = $date;
        $this-> body = $body;
    }

    public static function all() 
    {
        $files = File::files(resource_path("postss/"));

      return  array_map(function ($file){
            return $file-> getContents();
        }, $files);
        
    
    }

    public static function find($slug)
    {
        
        base_path();

         if (!file_exists($path = resource_path("postss/{$slug}.html"))) {
            throw new ModelNotFoundException();
        }
    
        return cache()-> remember("posts.{$slug}", 7 , function () use ($path){
           
         return file_get_contents($path);
    
        });
    
    
        
      
       

    }


}

我的路线class代码是

Route::get('/', function () {
  
    $files = File::files(resource_path("postss"));
    $posts =[];

    foreach ($files as $file) {
       $document[] = YamlFrontMatter::parseFile($file);
       $posts[]= new Post(
           $document->title,
           $document->excerpt,
           $document->date,
           $document->body()
       );
    }
});

The code is right as far as i know, I just don't know if there is something I need to add or do something to make the error go away.

Answer 1

我认为错误真的在这里

foreach ($files as $file) {
    // you load an array here !!!
    $document[] = YamlFrontMatter::parseFile($file);
    $posts[]= new Post(
       $document->title,        // then you use $document as a scalar?
       $document->excerpt,
       $document->date,
       $document->body()
   );
}

我想你可能需要做

foreach ($files as $file) {
   // you load an array here !!!
   $document = YamlFrontMatter::parseFile($file);
   $posts[]= new Post(
          $document->title,        
          $document->excerpt,
          $document->date,
          $document->body()
       );
}

Answer 2

错误在这个 foreach 循环内部

foreach ($files as $file) {
   $document[] = YamlFrontMatter::parseFile($file);
   $posts[]= new Post(
       $document->title,
       $document->excerpt,
       $document->date,
       $document->body()
   );
}

具体在这里

$document[] = YamlFrontMatter::parseFile($file);

您将新的 object 添加到数组 $document 中并在此处

$document->title,

您尝试直接从 $document 访问标题，您需要指定数组的索引才能访问具有属性的 object，类似这样

$document[0]->title,

或者您可以将第一部分重写为

$document = YamlFrontMatter::parseFile($file);

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