Template:P1
{{{1}}}
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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
The {{Px}} template is the generalized form. For example:
{{Px|1|foo|bar|baz|hello=world}}returns foo{{Px|2|foo|bar|baz|hello=world}}returns bar{{Px|3|foo|bar|baz|hello=world}}returns baz{{Px|hello|foo|bar|baz|hello=world}}returns world
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.
Accordingly, the generalized form is given by
{{Px|{{{1}}}|output if 1|output if 2|...|output if N}}