The templates P1 and P2 simply return the first respectively second unnamed input parameter respectively. For example:

  • {{P1|foo|bar|baz}} returns foo
  • {{P2|foo|bar|baz}} returns bar

These templates can be used inside other templates as an alternative to the {{#switch}} parser function, to switch between outputs based on whether the input is "1" or "2":

  • {{P{{{1}}}|output if 1|output if 2}}

Using {{#switch}}, this syntax is equivalent to

  • {{#switch:{{{1}}}|1=output if 1|2=output if 2}}

except that the parser function strips whitespace between parameters whereas the templates don't.

  • {{P-1}}, returns the last unnamed parameter