Difference between “!==” and “==!” [closed]

Answer 1

==! is not an operator

==! isn't a php comparison operator at all - it is the same as == ! (note the space)

I.e.

if ("a" !== " ") {
    // evaluates to true - "a" and " " are not equal
}

if ("a" == !" ") {
    // unreachable
} else {
    // evaluates to false - "a" is not equal to true (!" " evaluates to true)
}