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Defining items in the constructor

I have this little piece of code, I want to be able to define each element of the array as a new data element.

class Core_User
{
     protected $data_members = array(
         'id'               =>  '%d',
         'email'            => '"%s"',
         'password'         => '"%s"',
         'title'            => '"%s"',
         'first_name'       => '"%s"',
         'last_name'        => '"%s"',
         'time_added'       =>  '%d' ,
         'time_modified'    =>  '%d' ,
         );

    function __construct($id = 0, $data = NULL)
    {
        foreach($this->data_members as $member){
           //protected new data member
        }

    }
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3 answers


// protected new data member



You won't be able to create a non-public property at runtime. If security is paramount, you can declare a protected array or object and insert the key / values ​​into it in the constructor

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What you want to achieve is possible, however you will not be able to create new properties protected

(as this is only possible for predefined members).

function __construct($id = 0, $data = NULL)
{
    foreach($this->$data_memebers as $name => $value ){
       $this->$name = $value;
    }
}


Note the use of $

before name

in $this->$name

: this forces PHP to use the current value of the variable $name

as a property.

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  • Always use $ this when you want to access the members of an object (this should be $ this-> data_members in the constructor).

  • You can try defining the magic methods __get and __set (I'm not sure if they can be protected though).

    protected function __get($name){                  
 if (array_key_exists($name,$this->data_memebers))
 {
     return $this->data_memebers[$name];
 }         
 throw new Exception("key $name doesn't not exist");  
}  
protected function __set($name,$value){
 if (array_key_exists($name,$this->data_memebers))
 {
     $this->data_memebers[$name] = $value;
 }
 throw new Exception("key $name doesn't not exist");
}
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