Looking at the PHP manual it says:
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These functions are only available under Windows 9.x, ME, NT4 and 2000.
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And according to PECL where the library is hosted & maintained
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Extension to control a printer or or draw to printer device on Windows
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So it would look as if you need to find an alternative solution if you want to use a Linux server. So it comes down to what features were you looking to add when using these functions?