Using a constant in a PHP switch in PHP 5.5.9

Question

After installing PHP 5.5.9 on Ubuntu 14.04 (Trusty Tahr), I found this strange behavior with a switch statement and the PHP_OS constant.

I presume that in PHP 5.5.9 the switch statement is also checking for the same type (===)?

Or is it a PHP bug?

echo PHP_OS; // Linux
$os = PHP_OS;

switch (PHP_OS) {
    case "WINNT":
        echo 'Windows';
        break;
    case "Linux":
        echo 'Linux';
        break;
    default:
        echo 'Default';
        break;
}
// Default

switch ((string) PHP_OS) {
    case "WINNT":
        echo 'Windows';
        break;
    case "Linux":
        echo 'Linux';
        break;
    default:
        echo 'Default';
        break;
}
// Default

switch ($os) {
    case "WINNT":
        echo 'Windows';
        break;
    case "Linux":
        echo 'Linux';
        break;
    default:
        echo 'Default';
        break;
}
// Linux

In previous versions of php `switch (PHP_OS)` would return "Selecting Linux" — Asa Carter, Sep 03 '14 at 13:23
@AsaCarter What happens if you replace `switch (PHP_OS)` with `switch ((string) PHP_OS)` ? — Clément Malet, Sep 03 '14 at 13:30
@ClémentMalet, I've updated the question with that code. Surprisingly it still does not work. — Asa Carter, Sep 03 '14 at 13:36
I ran this code on PHP 5.5.9 with Ubuntu, I get the "Linux" output. — N.B., Sep 03 '14 at 13:40

score 2 · Answer 1 · edited Feb 02 '20 at 21:59

2

PHP switches use loose comparison like ==, so it should match.

Try:

switch (constant("PHP_OS"))

edited Feb 02 '20 at 21:59

Peter Mortensen

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answered Sep 03 '14 at 13:44

matwr

1,548
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score 0 · Answer 2 · answered Sep 29 '20 at 08:48

0

for those who want to have a solution for class constants we can use this method:

switch($var){
        case get_class_vars('CLASSNAME')['CONST_CLASS']:
break;

answered Sep 29 '20 at 08:48

Snoozer

585
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Using a constant in a PHP switch in PHP 5.5.9

2 Answers2

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