[GENERAL] Function for retreiving datatype

[Brendan Jurd]

Does postgres have a function to determine the data type of an 
argument?  I'm looking for something analogous to PHP's gettype 
function.  I had a look through the documentation and did a few likely 
pattern searches with \df.  Nothing came up.

Apologies in advance if the answer is obvious.
Cheers
BJ
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