PHP Multiple如果条件为真

Question

I have this PHP code:

$supplier = $line[2];
if ($supplier == "supplier")
{
} else {
Header("Location: premium.php");
}

Now I want that to include $supplier == "demo" to the PHP code to be as follows:

$supplier = $line[2];
if ($supplier == "supplier" && $supplier == "demo")
{
} else {
Header("Location: premium.php");
}

but the latter code is not working for either... I mean if the $supplier is equal to something else besides "supplier" or "demo" it is still bypassing it. It only worked for the first one.

How can I arrange it please?

Answer 1

The line if ($supplier == "supplier" && $supplier == "demo")

makes no sense. $supplier could not have changed in the middle of the conditional statement, thus that will never be true. You might be looking for || (or).

Answer 2

if ($supplier == "supplier" && $supplier == "demo")

can never be true, since the $supplier can never be both at same time. You need an OR there like so:

if ($supplier == "supplier" || $supplier == "demo")

Answer 3

Definitely take this opportunity to understand the meaning of && and || as others have mentioned, but if "or" is indeed the logic you're looking for, in this case I'd recommend this:

if ( in_array( $supplier, array( "supplier", "demo" ) ) )

Answer 4

"&&" means: both connected statements have to be true ! "||" means: one of the statements have to be true !

Your construct doesn't make sense, because you said $supplier has to be "demo" AND "supplier", which can never be true, as a $var can only have one value.

WRONG:

if ($supplier == "supplier" && $supplier == "demo") // AND would also work

RIGHT:

if ($supplier == "supplier" || $supplier == "demo") // OR would also work