Converting user input for XML-validation

[Ralph Kutschera <ecuapac@xxxxxx>]

Hallo!

  I'm having an HTML-form where the user can input anything. With PHP
I'm processing the input to XML like

<userinput>what the user has entered</userinput>

Now, if the user enters e.g "< thats a bracket", that gives

<userinput>< thats a bracket</userinput>

which of course does not validate.

Is there a standard function in PHP to convert any string for usage with
XML? In the example the string should become "&lt; thats a bracket".

Thanks a lot,
  Ralph

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