Which is Faster and better, Switch Case or if else if?

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Your first example is simply wrong. You need elseif instead of just else.

If you use if..elseif... or switch is mainly a matter of preference. The performance is the same.

However, if all your conditions are of the type x == value with x being the same in every condition, switch usually makes sense. I’d also only use switch if there are more than e.g. two conditions.

A case where switch actually gives you a performance advantage is if the variable part is a function call:

switch(some_func()) {
    case 1: ... break;
    case 2: ... break;
}

Then some_func() is only called once while with

if(some_func() == 1) {}
elseif(some_func() == 2) {}

it would be called twice – including possible side-effects of the function call happening twice. However, you could always use $res = some_func(); and then use $res in your if conditions – so you can avoid this problem alltogether.

A case where you cannot use switch at all is when you have more complex conditions – switch only works for x == y with y being a constant value.

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