php 意外的 T_VARIABLE，期待 T_FUNCTION
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unexpected T_VARIABLE, expecting T_FUNCTION
提问by Ryan Leonard
I am expecting this to be a basic syntax error I overlooked, but I can't figure it out.
我希望这是我忽略的基本语法错误，但我无法弄清楚。
In a PHP script, I keep getting the following error.
在 PHP 脚本中，我不断收到以下错误。
Parse error: syntax error, unexpected T_VARIABLE, expecting T_FUNCTION in [path]/scripts/users/database_connection.php on line 4
This occurs when my script to connect to the database is called with an include_once(). I stripped my script down to the most basic code (leaving in what is required by other code), and it still is calling this error.
当我连接到数据库的脚本使用include_once(). 我将脚本精简为最基本的代码（保留其他代码所需的内容），但它仍然调用此错误。
<?php
class UserDatabaseConnection
{
$connection = sqlite_open("[path]/data/users.sqlite", 0666);
public function lookupUser($username)
{
// rest of my code...
}
}
$udb = new UserDatabaseConnection;
?>
I have struggled with this for a while, and just wondered if anyone else could spot somewhere I went wrong.
我已经为此苦苦挣扎了一段时间，只是想知道是否有人可以发现我出错的地方。
回答by Sabeen Malik
You can not put
你不能放
$connection = sqlite_open("[path]/data/users.sqlite", 0666);
$connection = sqlite_open("[path]/data/users.sqlite", 0666);
outside the class construction. You have to put that line inside a function or the constructor but you can not place it where you have now.
在班级建设之外。您必须将该行放在函数或构造函数中，但不能将其放置在现有位置。
回答by Lekensteyn
You cannot use function calls in a class construction, you should initialize that value in the constructor function.
您不能在类构造中使用函数调用，您应该在构造函数中初始化该值。
From the PHP Manual on class properties:
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.
这个声明可能包括一个初始化，但这个初始化必须是一个常量值——也就是说，它必须能够在编译时被评估，并且必须不依赖于运行时信息才能被评估。
A working code sample:
一个工作代码示例：
<?php
class UserDatabaseConnection
{
public $connection;
public function __construct()
{
$this->connection = sqlite_open("[path]/data/users.sqlite", 0666);
}
public function lookupUser($username)
{
// rest of my code...
// example usage (procedural way):
$query = sqlite_exec($this->connection, "SELECT ...", $error);
// object oriented way:
$query = $this->connection->queryExec("SELECT ...", $error);
}
}
$udb = new UserDatabaseConnection;
?>
Depending on your needs, protectedor privatemight be a better choice for $connection. That protects you from accidentally closing or messing with the connection.
根据您的需要，protected或者private可能是$connection. 这可以防止您意外关闭或弄乱连接。
回答by duri
Use access modifier before the member definition:
在成员定义之前使用访问修饰符：
private $connection;
As you cannot use function call in member definition in PHP, do it in constructor:
由于您不能在 PHP 的成员定义中使用函数调用，请在构造函数中执行：
public function __construct() {
$this->connection = sqlite_open("[path]/data/users.sqlite", 0666);
}
回答by Stijn Leenknegt
put public, protected or private before the $connection.
在 $connect 之前放置 public、protected 或 private。
