Question

<?php

class Question_model extends CI_Model {
  public $answers;

  public function filter_answers($value){
    if(is_string($value))
    {
      if(strpos($value,"option") !== false){
        $this->$answers[] = str_replace("option","",$value);
      }
    }
  }
  public function create_question($data){
      $data = array(
        'explanation' => $data['exp'],
        'name' => $data['name']
      );

      $this->db->insert('question', $data);

      array_filter($data,array($this,"filter_answers"));
      echo $this->$answers;
  }
}

我正在使用codeigniter框架，我在模型中得到这个，因为你可以看到变量实际上已定义，而不是相反。我从codeigniter控制器调用模型。

Answer 1

您必须使用 $this->answers 而不是$this->$answers来调用 answer 属性。

<?php

class Question_model extends CI_Model {
  public $answers;

  public function filter_answers($value){
    if(is_string($value))
    {
      if(strpos($value,"option") !== false){
        $this->answers[] = str_replace("option","",$value);
      }
    }
  }
  public function create_question($data){
      $data = array(
        'explanation' => $data['exp'],
        'name' => $data['name']
      );

      $this->db->insert('question', $data);

      array_filter($data,array($this,"filter_answers"));
      echo $this->answers;
  }
}

Answer 2

双箭头运算符“=＆gt;”用作访问机制阵列。这意味着它左侧的内容将具有数组右侧的对应值上下文。这可用于将任何可接受类型的值设置为a 数组的对应索引。索引可以是关联的（字符串基于）或数字。

<?php
$myArray = array(
 0 => 'Big',
 1 => 'Small',
 2 => 'Up',
 3 => 'Down'
 );
 ?>

对象操作符“ - ＆gt;”在对象范围中用于访问方法和对象的属性。它的意思是说什么在上面运算符的权限是实例化的对象的成员运算符左侧的变量。实例化是关键这里的术语。

  <?php
    $obj = new MyObject(); // Create a new instance of MyObject into $obj
    $obj->thisProperty = 'Fred'; // Set a property in the $obj object called thisProperty
    $obj->getProperty(); // Call a method of the $obj object named getProperty
    ?>

示例

<?php class Question_model extends CI_Model { public $answers; public function filter_answers($value){ if(is_string($value)) { if(strpos($value,"option") !== false){ $this->answers[] = str_replace("option","",$value); } } } public function create_question($data){ $data = array( 'explanation' => $data['exp'], 'name' => $data['name'] ); $this->db->insert('question', $data); array_filter($data,array($this,"filter_answers")); echo $this->answers; } }

未定义的变量回答eventHough变量已定义

2 个答案: