在私有类成员定义中使用count(）会导致分析错误 - Using count() in private class member definition results in Parse error

Using count() in private class member definition results in Parse error

本文关键字：错误 count 成员定义 | 更新日期: 2023-09-27

当我在php类中定义私有变量时使用count时，它会抛出一个错误。这是我的班级

class setup {
private $acctListArr = array(4533,4534,4535,4536,4537,4538,4539,4540,4541,4542,4543,4544,4545,4546,4547,4548,4549,4550,4551,4552,4553,4554,4555,4556,4557,4559,4560,4561,4562,4563,4564,4565,4566,4567,4568,4569,4570,4571,4572,4573,4574,4575,45766,4577,4578,4579,4580,4581,4582,4583,4584,4585,4586,4587,4588,4589,4590,4591,4592,4593,4594,4595,4596,4597,4598,4599,4600,4601,4602,4603,4604,4605,4606,4607,4608,4609,4610,4611,4612,4613,4614,4615,4616,4617,4618);
private $acctsInList = count($this->acctListArr);
public function __construct() {
}
}

当在浏览器中访问类时，它会抛出一个错误：

分析错误：语法错误，在第7行C:''examplep''htdocs''dev.virtualnerd.com_classes''setup.class.php中出现意外的"（"，应为"，"或"；"

第7行为private $acctsInList = count($this->acctListArr);

你可以不这样定义一个私有变量吗？

不，你不能。类属性不能用计算值定义（例如，函数调用）。

来自文档：

此声明可能包括一个初始化，但此初始化必须是一个常数值——也就是说，它必须能够在编译时进行求值，并且必须不依赖于运行时信息才能进行求值。

正如其他人所指出的，您可以改为进行该计算，并在构造函数中进行赋值。

不能在实例变量的声明中调用函数。相反，在构造函数中这样分配：

 private $acctListArr = array(4533,4534,4535,4536,4537,4538,4539,4540,4541,4542,4543,4544,4545,4546,4547,4548,4549,4550,4551,4552,4553,4554,4555,4556,4557,4559,4560,4561,4562,4563,4564,4565,4566,4567,4568,4569,4570,4571,4572,4573,4574,4575,45766,4577,4578,4579,4580,4581,4582,4583,4584,4585,4586,4587,4588,4589,4590,4591,4592,4593,4594,4595,4596,4597,4598,4599,4600,4601,4602,4603,4604,4605,4606,4607,4608,4609,4610,4611,4612,4613,4614,4615,4616,4617,4618);
 private $acctsInList;
 public function __construct() {
     $this->acctsInList = count($this->acctListArr);
 }

您想要的是

class setup {
private $acctListArr = array(4533,4534,4535,4536,4537,4538,4539,4540,4541,4542,4543,4544,4545,4546,4547,4548,4549,4550,4551,4552,4553,4554,4555,4556,4557,4559,4560,4561,4562,4563,4564,4565,4566,4567,4568,4569,4570,4571,4572,4573,4574,4575,45766,4577,4578,4579,4580,4581,4582,4583,4584,4585,4586,4587,4588,4589,4590,4591,4592,4593,4594,4595,4596,4597,4598,4599,4600,4601,4602,4603,4604,4605,4606,4607,4608,4609,4610,4611,4612,4613,4614,4615,4616,4617,4618);
private $acctsInList = 0;
public function __construct() {
  $this->acctsInList = count($this->acctListArr);
}

}

您可以像这样编写类

class setup {
    private $acctListArr = array(4533,4534,4535,4536,4537,4538,4539,4540,4541,4542,4543,4544,4545,4546,4547,4548,4549,4550,4551,4552,4553,4554,4555,4556,4557,4559,4560,4561,4562,4563,4564,4565,4566,4567,4568,4569,4570,4571,4572,4573,4574,4575,45766,4577,4578,4579,4580,4581,4582,4583,4584,4585,4586,4587,4588,4589,4590,4591,4592,4593,4594,4595,4596,4597,4598,4599,4600,4601,4602,4603,4604,4605,4606,4607,4608,4609,4610,4611,4612,4613,4614,4615,4616,4617,4618);
    private $acctsInList = 0;
    public function __construct() {
        $this->acctsInList = count($this->acctListArr);
    }
}