Question

<?php
class abhi
{
    var $contents="default_abhi";

    function abhi($contents)
    {
        $this->$contents = $contents;
    }

    function get_whats_there()
    {
        return $this->$contents;
    }

}

$abhilash = new abhi("abhibutu");
echo $abhilash->get_whats_there();

?>

i 初始变数内容为缺省,也是建筑商,为什么不印刷价值,什么东西应当纠正?

见错误,

abhilash@abhilash:~$ php5 pgm2.php 

Fatal error: Cannot access empty property in /home/abhilash/pgm2.php on line 13
abhilash@abhilash:~$

Answer 1

你们正在以不正确的方式返回这一职能。应当:

return $this->contents

Answer 2

由于这个问题被贴上“php5”的标签,因此,这里的表格有:(即:公共/保护/私营而非破产、公共/保护/私人职能、__ 建设(而不是类别)......)

class abhi {
  protected $contents="default_abhi";

  public function __construct($contents) {
    $this->contents = $contents;
  }

  public function get_whats_there() {
    return $this->contents;
  }
}

$abhilash = new abhi("abhibutu");
echo $abhilash->get_whats_there();

Answer 3

如果正确回顾,

$this->contents = $contents;

不适用

$this->$contents = $contents;

Answer 4

申请和写给提款; 申请数额不超过3美元;

Answer 5

而且,你是否没有在“血汗”中填写一美元,而“植被——什么? (bhilash->)

Answer 6

use $this->contents
i too at first had the same problem

Answer 7

You have a problem with $: 1. when using $this-> you do not put $ between "->" and the variable name the "$" sign, so your $this->$contents should be $this->contents. 2. in your echo youforgot the $ when calling that function from the instantiated class.

因此,你的正确守则是:

<?php
class abhi
{
    var $contents="default_abhi";

    function abhi($contents)
    {
        $this->contents = $contents;
    }

    function get_whats_there()
    {
        return $this->contents;
    }

}

$abhilash = new abhi("abhibutu");
echo $abhilash->get_whats_there();

?>

友情链接