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we can not use $this (object properties) inside static methods 
class Wheather {
    public $nonStatic = 0;
    public static $tempConditions = ['cold', 'mild', 'warm'];
    public static $someProperty = 5;

    static function celsiusToFarenheit($celsius) {
        return $celsius * 9 / 5 + 32 + $this->nonStatic;
    }
}

echo Wheather::celsiusToFarenheit(0);
echo "\n";
In this case we will get the error: 
Fatal error:  Uncaught Error: Using $this when not in object context
by Valeri Tandilashvili
4 years ago
PHP
OOP
3
Pro tip: use ```triple backticks around text``` to write in code fences