分配数组作为数组元素的PHP的类变量/属性

问题描述：

class Dbhead{ 

public static $category=array(
"id"=>"Id", 
"title"=>"Title", 
"code"=>"Code", 
"description"=>"Description", 
"remarks"=>"Remarks" 
); 

public static $client=array(
"id"=>"Id", 
"title"=>"Title", 
"name"=>"Name", 
"mobile"=>"Mobile", 
"address"=>"Address", 
"remarks"=>"Remarks" 
); 

    public $allfields=array(
     "client"=>self::$client, 
     "category"=>self::$category 
    ); 
}

分配$client & $category阵列$allfields作为元素中断的代码。我已尝试将$client & $category更改为仅公开。

我已经尝试了所有可能的方法，我知道要实现它，除了使用方法/函数，因为我不想这样做。

在你的'__construct（）'方法中做。 –

从[PHP文档]（http://www.php.net/manual/en/language.oop5.properties.php）这个声明可能包含一个初始化，但是这个初始化必须是一个常量值 - 即，它必须能够在编译时进行评估，并且不得依赖运行时信息进行评估。“......即，你不能......你必须定义一些像这样动态的东西在方法 –

@Julien我不想使用任何方法。我在寻找替代品。 '__construct（）'是一个魔术棒。我正在尝试，因为它是从过程到面向对象的过渡时间。 –

答

你不能。 manual says so。

作为一种变通，你可以这样做：

class Dbhead 
{ 
    public static $category = [ 
     "id"   => "Id", 
     "title"  => "Title", 
     "code"  => "Code", 
     "description" => "Description", 
     "remarks"  => "Remarks", 
    ]; 

    public static $client = [ 
     "id"  => "Id", 
     "title" => "Title", 
     "name" => "Name", 
     "mobile" => "Mobile", 
     "address" => "Address", 
     "remarks" => "Remarks", 
    ]; 

    public static $allfields; 

    // Arguably not the most elegant way to solve the problem 
    // Since this is a setter without an argument 
    public static function setClient() 
    { 
     static::$allfields['client'] = static::$client; 
    } 

    public static function setCategory() 
    { 
     static::$allfields['category'] = static::$category; 
    } 
}

或非静态的东西。你可以混合静态和非静态，但嘿，这不是很好。

class DbHead{ 
    protected $category, $client, $allFields; 

    public function __construct(array $category,array $client) 
    { 
     $this->category = $category; 
     $this->client = $client; 

     $this->allFields['client'] = $client; 
     $this->allFields['category'] = $category; 
    } 

    public function getCategory() 
    { 
     return $this->category; 
    } 

    public function getClient() 
    { 
     return $this->client; 
    } 

    public function getAllFields() 
    { 
     return $this->allFields; 
    } 

    // Alternatively provide setters for each field in particular 
    // If you don't wish to initialize the values on class instantiation 

    public function setCategory(array $category) 
    { 
     $this->category = $category; 

     return $this; 
    } 
    public function setClient(array $client) 
    { 
     $this->client = $client; 
     return $this; 
    } 

    public function createAllFields() 
    { 
     $this->allFields['client'] = $this->client; 
     $this->allFields['category'] = $this->category; 
    } 
} 

$dbHead = new DbHead([ 
    "id"   => "Id", 
    "title"  => "Title", 
    "code"  => "Code", 
    "description" => "Description", 
    "remarks"  => "Remarks", 
], [ 
    "id"  => "Id", 
    "title" => "Title", 
    "name" => "Name", 
    "mobile" => "Mobile", 
    "address" => "Address", 
    "remarks" => "Remarks", 
]); 

$dbHead->createAllFields();

但是，当我以程序方式或非OOP方式（即，没有Class）执行此操作时，此工作正常。 –

当然，它在非OOP中工作得很好，它只是分配内容。但是如果你想在课堂上学习，你必须以正确的方式来完成。 –

@andrew与__construct（）不同，我需要触发setClient（）和setCategory（）吗？ –

分配数组作为数组元素的PHP的类变量/属性

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