PHP - 有没有更好的方法找到几个中的整数？

Question

Currently I'm using the following approach to determine if $userlevel is either 10 , 20 , or 30 .

if ( in_array( $userlevel, array( 10, 20, 30 ) ) ) { 

} 

Is there a better way to do this?

Answer 1

You are already using the "better way". The alternative would be

if ($userlevel == 10 || $userlevel == 20 || $userlevel == 30) {

}

Typically you'd write a basic if statement until the number of possible values grows such that the line becomes too long, and then you move them into a collection and use in_array .

If you know that $userlevel will always be one of those values, you could simply test that it's between the upper/lower bound, but this won't be any shorter than the way you're writing it now.

Answer 2

I think there is not a "better" way. It depends on what you expect the values you want to choose from develop in the future. You could use a switch with no break.

switch ($userlevel) {
    case 10: case 20: case 30
        // ..
        break;
    default:
        // ..
}

Edit

Of course there is great benefit from the in_array solution. You can store your decision array in a variable and are able to influence it from somewhere else.

Answer 3

没有更好的方法与in_array进行比较。