使用PHP访问Static方法内的Class属性的最佳方法

Question

Here is my class property

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...

public static function is_image($file_path)
{

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

    echo $imagemagick;
}

Of course this gives me errors like

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.

How should I handle this?

Answer 1

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

self::$my_paths['imagemagick']

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

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.