SetYTitle — Sets the Y axis title, and optionally its position
$plot->SetYTitle($ytitle, [$ypos])
SetYTitle sets the text to be displayed as the Y axis
title. Optionally, it also sets the position of the title and the axis
itself: on the left side of the graph (the usual place), on the right side,
both, or neither.
$ytitleThe text string to use for the Y axis title. The string can contain multiple lines, separated by newlines (in PHP: "\n").
$yposOptional position for the Y axis and title. Use one of the following strings for the position:
| Position | Description |
|---|---|
| plotleft | Y axis on the left side of the plot |
| plotright | Y axis on the right side of the plot |
| both | One Y axis on the left, and one on the right |
| none | No Y axis, no Y axis title |
The default is 'plotleft'.