src/Sparkline/FormatTrait.php
public function setPadding($padding)
    {
        list($top, $right, $bottom, $left) = $this->paddingStringToArray($padding);
        $this->padding['top'] = $top;
        $this->padding['right'] = $right;
        $this->padding['bottom'] = $bottom;
        $this->padding['left'] = $left;
    }
public function setPadding($padding)
    {
        list($top, $right, $bottom, $left) = $this->paddingStringToArray($padding);
        $this->padding['top'] = $top;
        $this->padding['right'] = $right;
        $this->padding['bottom'] = $bottom;
        $this->padding['left'] = $left;
    }
Set padding : format top right bottom left
ex: 0 10 0 10.

@param string $padding