PHP分段错误| 在类中为受保护的属性调用__get？

Question

I have a class with the methods __toString and __get and some protected properties such as "message". So far, so good.

The problem now is that I need to access $this->message in __toString, and this causes (NOT ALWAYS BUT OFTEN) a segmentation fault when (see following example) $display_all is set to true. Do you know why and how to fix it ?

Thanks a lot ! Rolf

PS: here is an example

class FuckedClass {
    protected $file;
    protected $line;
    protected $display_all;
    protected $message;

    //[...]

    /**
     * Magic getter
     * @param String $name
     * @return mixed
     */
    public function __get($name) {
        return  (in_array($name,array_keys(get_class_vars(__CLASS__))))?
                    $this->$name : null;
    }
    /**
     * Formats
     */
    public function __toString() {
        $message = $this->message . ($this->display_all) ?
                 '[ Location: '.$this->file.' @ line '.$this->line.' ]':
                 '';
        $text =<<<PLAIN
Error : {$message}
PLAIN;
        return $text;
    }
}

//instantiated $fucked_class
die($fucked_class);    

Answer 1

Actually, __toString is just a method called when variable is being typed to string, or the method itself is called. It behaves as any other class method, so this code must work:

class Foo {
    protected $message = "bar";

    public function __toString()
    {
        return $this->message;
    }
}

Or you may have some problem in the __get, please post it's contend and I'll edit my answer.