In this post, I am sharing a demonstration How to pass the string array as an input parameter in stored function of PostgreSQL.

We already used a different approach to pass multiple values as a single input parameter like comma separated, XML Parameter, Table Type.
You can also find one more type which is an array of PostgreSQL.

I created a stored function for this demonstration.
In the below, the stored function I declared one input parameter as a string array and using for..loop I am fetching record from this array and storing into one temporary table.

CREATE OR REPLACE FUNCTION fn_PostgresArray
(
    ArrayText character varying[]
)
RETURNS TABLE (outArrayTextData CHARACTER VARYING(250)) AS
$BODY$
DECLARE 	
	Counter INT = 0 ;	
BEGIN	
	CREATE TEMP TABLE ArrayData(ArrayTextData CHARACTER VARYING(250));	
	FOR Counter in array_lower(ArrayText, 1) .. array_upper(ArrayText, 1)
	LOOP
		INSERT INTO ArrayData VALUES(ArrayText[Counter]);		
	END LOOP;

	RETURN QUERY 
	SELECT ArrayTextData
	FROM ArrayData;

	DISCARD TEMP;
END;
$BODY$
LANGUAGE plpgsql VOLATILE
COST 100;

SELECT *FROM fn_PostgresArray(ARRAY['Apple', 'Orange', 'Mango']);