• dot20@lemmy.world
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    1 year ago

    Ah, I understand now. The expression is evaluated like this:

    • $a == 1 ? "one" : $a == 2 ? "two" : $a == 3 ? "three" : "other"
    • $a == 2 ? "two" : $a == 3 ? "three" : "other"
    • "two" ? "three" : "other"
    • "three"
      • sanguinet@lemmy.ca
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        1 year ago

        It’s cause PHP associates the if-then-else pair only with its immediate “else” option, not with the entirety of the line.

        Let’s go by parts.

        $a == 1 ? "one" : $a == 2 ? "two" : $a == 3 ? "three" : "other"

        Is $a equal to 1? If so, we’re “set” to the value on the left, which is "one", if not then we’re set to the value on the right, which is $a == 2. $a is not equal to 1, so we’re set to the right value, $a == 2.

        This replaces the relevant part, $a == 1 ? "one" : $a == 2, with $a == 2. So we’re left with:

        $a == 2 ? "two" : $a == 3 ? "three" : "other"

        Next, is $a equal to 2? If so, we’re set to "two", if not we’re set to $a == 3. The comparison is true, so we’re set to the value on the left, "two". The relevant part here is $a == 2 ? "two" : $a == 3 only, so it replaces it with "two" cause again, PHP is only associating with its immediate pair. So now we’re left with:

        "two" ? "three" : "other"

        Finally, is "two" truthy? If so, we’re set to "three", if not we’re set to "other". Since "two" is truthy we’re then left with "three".

        It’s super confusing for sure.