带有 goto 的 PHP 数字大小写

Question

I pleasantly found that it is possible to use goto in PHP:

    case 222: return "A"; break;
    case 231: return "B"; break;
    case 234: goto 231;
    case 237: return "C"; break;
    case 251: goto 231;
    case 285: return "D"; break;

I have some code like this. There are a lot of keys that shared the same value, so I am trying to use goto to eliminate redundancy. I'm use a switch since it's simpler here than if/else branching.

For various reasons, each case must be explicitly defined as above, even if it just goes to another case. However, running this through a validator, I get Parse error: syntax error, unexpected ''231'' (T_CONSTANT_ENCAPSED_STRING), expecting identifier (T_STRING) in your code

I tried surrounding the cases with single quotes, but that still didn't pass. This seems in line with the example above. What am I missing syntax-wise here?

Answer 1

Label cannot be numeric only, so you could only solve it by creating extra label for cases you want to target (and also modifying gotos with those new labels):

<?php

function foo($value) {
    switch ($value) {
        case 222:
            return "A";
        case 231:
            label231: // new label here
            return "B";
        case 234:
           goto label231;
        case 237:
           return "C";
        case 251: 
           goto label231;
        case 285:
           return "D";
    }
}

var_dump(foo(251));

However as mentioned in the comments, I would prefer choosing a different approach (associative array etc.).