protected function getLoad(): ?string
	{
		$load = $this->readFileAsArray('/proc/loadavg', ' ');
		if ($load) {
			unset($load[3], $load[4]);
			return implode(' ', $load);
		}
		return null;
	}
protected function getLoad(): ?string
	{
		$load = $this->readFileAsArray('/proc/loadavg', ' ');
		if ($load) {
			unset($load[3], $load[4]);
			return implode(' ', $load);
		}
		return null;
	}
protected function getLoad ( ) : ? string { $ load = $ this -> readFileAsArray ( '/proc/loadavg' , ' ' ) ; if ( $ load ) { unset ( $ load [ 3 ] , $ load [ 4 ] ) ; return implode ( ' ' , $ load ) ; } return null ; }
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@return string|null
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