静态数组属性在 php 中是不可能的吗？
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Is static array property not possible in php?
提问by user1463076
Below is my code in php,and I am getting error:
下面是我在 php 中的代码，我收到错误：
Parse error: syntax error, unexpected '[' in /LR_StaticSettings.php on line 4
解析错误：语法错误，第 4 行 /LR_StaticSettings.php 中出现意外的“[”
<?php
class StaticSettings{
function setkey ($key, $value) {
self::arrErr[$key] = $value; // error in this line
}
}
?>
I want to use statically not $this->arrErr[$key]so that I can get and set static properties without creating instance/object.
我想静态使用 not$this->arrErr[$key]以便我可以在不创建实例/对象的情况下获取和设置静态属性。
Why is this error? Can't we create static array?
为什么会出现这个错误？我们不能创建静态数组吗？
If there is another way, please tell me. Thanks
如果有其他方法，请告诉我。谢谢
回答by nickb
You'd need to declare the variable as a static member variable, and prefix its name with a dollar sign when you reference it:
您需要将该变量声明为静态成员变量，并在引用它时在其名称前加上美元符号：
class StaticSettings{
private static $arrErr = array();
function setkey($key,$value){
self::$arrErr[$key] = $value;
}
}
You'd instantiate it like this:
你会像这样实例化它：
$o = new StaticSettings;
$o->setKey( "foo", "bar");
print_r( StaticSettings::$arrErr); // Changed private to public to get this to work
You can see it working in this demo.
你可以在这个演示中看到它的工作。
回答by Matt
Your code doesn't define $arrErras a static member variable. You should declare it as
您的代码未定义$arrErr为静态成员变量。你应该把它声明为
<?php
class StaticSettings{
public static $arrErr = array();
function setkey($key,$value){
self::arrErr[$key] = $value;
}
}
?>
