How to get a value from a table using functions and return count

How to get a value from a table using functions and return count:

Write a simple query and pass the parameters:
function somename($tablename, $colnam, $colvalue, $mode, $returncolnam)
{
Select $returncolnam from $tablenam where $colnam=$colval
}
Note: For $returncolnam you can also use array number starting from 0.

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