代码笔记-----$this->table('classes')->where('id='.$id)->find();

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问：php中有 $this->table('classes')->where('id='.$id)->find(); 请问如何理解？

答：

class a{
  private $table;
  private $where;
  public function table($tableName){
      $this->table = $tableName;
      return $this;
  }
  public function where($where){
      $this->where = $where;
      return $this;
  }
  public function find(){
    $sql = "select * from".$this->$table."where ".$this->where;
 }
 }

}
基本上是这种 其实就是return $this;这会返回当前的类的对象引用 所以你$this->table('classes')->where()继续执行where方法