PHP 解析错误：语法错误，意外的 T_OBJECT_OPERATOR
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/13388541/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
PHP Parse error: syntax error, unexpected T_OBJECT_OPERATOR
提问by user1825110
I got this error when debugging my code:
调试代码时出现此错误：
PHP Parse error: syntax error, unexpected T_OBJECT_OPERATOR in order.php on line 72
PHP 解析错误：语法错误，第 72 行 order.php 中的意外 T_OBJECT_OPERATOR
Here is a snippet of the code (starting on line 72):
这是代码片段（从第 72 行开始）：
$purchaseOrder = new PurchaseOrderFactory->instance();
$arrOrderDetails = $purchaseOrder->load($customerName);
回答by SirDarius
Unfortunately, it is not possible to call a method on an object just created with newbefore PHP 5.4.
不幸的是，无法new在 PHP 5.4 之前创建的对象上调用方法。
In PHP 5.4 and later, the following can be used:
在 PHP 5.4 及更高版本中，可以使用以下内容：
$purchaseOrder = (new PurchaseOrderFactory)->instance();
Note the mandatory pair of parenthesis.
请注意强制性的一对括号。
In previous versions, you have to call the method on a variable:
在以前的版本中，您必须对变量调用该方法：
$purchaseFactory = new PurchaseOrderFactory;
$purchaseOrder = $purchaseFactory->instance();
回答by Samuel Cook
change to as your syntax was invalid:
更改为您的语法无效：
$purchaseOrder = PurchaseOrderFactory::instance();
$arrOrderDetails = $purchaseOrder->load($customerName);
where presumably instance()creates an instance of the class. You can do this rather than saying new
其中大概instance()创建了类的一个实例。你可以这样做而不是说new
回答by Vyktor
You can't use (it's invalid php syntax):
您不能使用（这是无效的 php 语法）：
new PurchaseOrderFactory->instance();
You probably meant one of those:
您可能指的是其中之一：
// Initialize new object of class PurchaseOrderFactory
new PurchaseOrderFactory();
// Clone instance of already existing PurchaseOrderFactory
clone PurchaseOrderFactory::instance();
// Simply use one instance
PurchaseOrderFactory::instance();
// Initialize new object and that use one of its methods
$tmp = new PurchaseOrderFactory();
$tmp->instance();
