关于php：解析错误：语法错误，Parse error: syntax error, unexpected ‘(‘, expecting ‘,’ or ‘;’ in

Parse error: syntax error, unexpected '(', expecting ',' or ';' in

我收到以下分析错误：

Parse error: syntax error, unexpected '(', expecting ',' or ';' in
H:\Programs\USBWebserver
v8.5\8.5
oot\oopforum\func
egister.class.php on line 7

这与我班的以下代码行有关：

1	private $random_name = rand(1000,9999).rand(1000,9999).rand(1000,9999).rand(1000,9999);

我不明白这行代码为什么会导致分析错误？

以下是一些周边代码：

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class register{
public $post_data = array();
private $dbh;
private $allowed_type = array('image/jpeg','image/png','image/gif');
private $random_name = rand(1000,9999).rand(1000,9999).rand(1000,9999).rand(1000,9999);
private $path = 'img/thumb_/'.$random_name. $_FILES['file']['name'];
private $max_width = 4040;
private $max_height = 4040;
private $max_size = 5242880;
private $temp_dir = $_FILES['file']['tmp_name'];
private $image_type = $_FILES['file']['type'];
private $image_size = $_FILES['file']['size'];
private $image_name = $_FILES['file']['name'];
private $image_dimensions = getimagesize($temp_dir);
private $image_width = $image_dimensions[0]; // Image width
private $image_height = $image_dimensions[1]; // Image height
private $error = array();

public function __construct($post_data, PDO $dbh){
$this->post_data = array_map('trim', $post_data);
$this->dbh = $dbh;
}
}

导致分析错误的原因是什么？

您不能将成员变量初始化为任何非静态的，并且您试图调用一个函数。

从手册中：

This declaration may include an initialization, but this
initialization must be a constant value--that is, it must be able to
be evaluated at compile time and must not depend on run-time
information in order to be evaluated.

解决方法是在构造函数中设置变量：

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private $random_name;
public function __construct() {
$this->random_name = rand(1000,9999).rand(1000,9999).rand(1000,9999).rand(1000,9999);
}