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I’m trying to basically use if statement that says
if ($_POST['mc_gross_1'] != '20' || $_POST['mc_gross_1'] != '19')
which if it’s not equal to 19 or 20 I give an error but it’s not working. What am I doing wrong?
You need to use
&&or AND, not||or OR. OR is checking both values. A variable cannot be equal to two different numbers at the same time.