SetXTitle
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## SetXTitle

SetXTitle — Sets the X axis title, and optionally its position

## Synopsis

    $plot->SetXTitle($xtitle, [$xpos])

## Description

`SetXTitle` sets the text to be displayed as the X axis title. Optionally, it also sets the position of the title and the axis itself: below the graph (the usual place), above the graph, both, or neither.

## Parameters

`$xtitle`

  The text string to use for the X axis title. The string can contain multiple lines, separated by newlines (in PHP: "\n").

`$xpos`

  Optional position for the X axis and title. Use one of the following strings for the position:

  Position | Description
  --- | ---
  plotdown | X axis below the plot
  plotup | X axis above the plot
  both | One X axis above, and one below
  none | No X axis, no X axis title

  The default is 'plotdown'.

## Notes

By default, there is no X axis title. If `SetXTitle` is called with an empty string as the title, the default behavior is restored. This includes not leaving space on the graph for the title.

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