======urlencode======

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URL-encode a [[PTPScript:Types:String|String]] according to RFC 1738.

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**Syntax**
  * ''[[PTPScript:Types:String|String]] urlencode( [[PTPScript:Types:String|String]] subject )''

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**Parameters**
  * [[PTPScript:Types:String|String]] ''subject'' - The String to be URL-encoded.

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**Result**
  * [[PTPScript:Types:String|String]] - The encoded String.
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Returns ''subject'' with all non-alphanumeric characters except underscores (_) replaced by percentage signs (%) followed by a hexadecimal character code.