使用PHP访问Static方法内的Class属性的最佳方法

Here is my class property

这是我的班级财产

private $my_paths = array(
        'imagemagick' => 'E:\Server\_ImageOptimize\ImageMagick',
        'pngcrush' => 'E:\Server\_ImageOptimize\pngCrush\pngcrush.exe',
        'jpegtran' => 'E:\Server\_ImageOptimize\jpegtran\jpegtran.exe',
        'gifsicle' => 'E:\Server\_ImageOptimize\gifsicle\gifsicle.exe',
        'pngquant' => 'E:\Server\_ImageOptimize\pngquant\pngquant.exe',
        'pngout' => 'E:\Server\_ImageOptimize\pngout\pngout.exe'
);

There is a static method in the same class...

同一个类中有一个静态方法......

public static function is_image($file_path)
{

    $imagemagick = $this->my_paths['imagemagick']. '\identify';

    echo $imagemagick;
}

Of course this gives me errors like

当然这给我带来了错误

Fatal error: Using $this when not in object context...

I then tried accessing the property like this self::my_paths['imagemagick'] but that did not help.

然后我尝试访问该属性,如self :: my_paths ['imagemagick'],但这没有帮助。

How should I handle this?

我该怎么处理?

4 个解决方案

#1

You need the $ sign in front of the variable/property name, so it becomes:

您需要变量/属性名称前面的$符号,因此它变为:

self::$my_paths['imagemagick']

And my_paths is not declared as static. So you need it to be

并且my_paths未声明为静态。所以你需要它

private static $my_paths = array(...);

When it does not have the "static" keyword in front of it, it expects to be instantiated in an object.

当它前面没有“static”关键字时,它希望在一个对象中实例化。

#2

you cannot access non-static properties in static methods, you either should create an instance of the object in the method or declare the property as static.

您无法在静态方法中访问非静态属性,您应该在方法中创建对象的实例,或者将属性声明为静态。

#3

make it static property

使它成为静态属性

   private static $my_paths = array(
    'imagemagick' => 'E:\Server\_ImageOptimize\ImageMagick',
    'pngcrush' => 'E:\Server\_ImageOptimize\pngCrush\pngcrush.exe',
    'jpegtran' => 'E:\Server\_ImageOptimize\jpegtran\jpegtran.exe',
    'gifsicle' => 'E:\Server\_ImageOptimize\gifsicle\gifsicle.exe',
    'pngquant' => 'E:\Server\_ImageOptimize\pngquant\pngquant.exe',
    'pngout' => 'E:\Server\_ImageOptimize\pngout\pngout.exe'
   );

and call it like this

并称之为这样

   self::$my_paths['pngcrush'];

#4

If possible, you could make your variable my_path static also.

如果可能,您也可以将变量my_path设为静态。

self::my_paths['imagemagick'] does not work, because the array is private and could not used in a static context.

self :: my_paths ['imagemagick']不起作用,因为该数组是私有的,无法在静态上下文中使用。

Make your variable static and it should work.

让你的变量静态,它应该工作。

#1