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PHP: toggle strange behavior

Possible duplicate:
PHP expresses two different strings the same

I have a problem understanding what is causing this strange behavior in a case switch statement.

The code looks like this:

<?php
$myKey = "0E9";

switch ($myKey) {
    case "0E2":
        echo "The F Word";
        break;
    case "0E9":
        echo "This is the G";
        break;
    default:
        echo "Nothing here";
        break;
}
?>

The result of this command should be This G

Well, not like that. always returns Word F

If we reverse the left instructions 0E9 to begin with and try to find the value 0E2

<?php
$myKey = "0E2";

switch ($myKey) {
    case "0E9":
        echo "The G String";
    break;
    case "0E2":
        echo "The F Word";
        break;       
    default:
        echo "Nothing here";
        break;
}
?>

Now it always comes back It's G

The values

0E2 and 0E9 are not interpreted as text? Are these values ​​reserved?

Can anyone explain this behavior?

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2 answers


"0E2" == "0E9"

true

because they are numeric strings .

Note. the switch uses free comparison .



Check this question: PHP expresses two different strings as the same .

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Numeric strings like these are equal to each other .. always. Unfortunately, there is no way to force an equivalence comparison via switch

. You just need to use if

:

if ($myKey === '0E9') {
   echo 'g';
}
else if ($myKey === '0E2') {
   echo 'f';
}
else {
   echo "Nothing here";
}


You could also trim the leading zero, I suppose.

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