PHP switch case $_GET's variables and switch case $_GET's variable's values

问题

Say I have an URL like www.mysite.com/index.php?login=0. Is it possible to switch case $_GET's variables and switch case $_GET's variable's values?

Something like:

switch ($_GET) {
    case 'login' :
        switch($_GET['login']) {
            case '0' :
                echo 'Login failed!';
                break;
            case '1' :
                echo 'Login successful.';
                break;
        }
        break;
    case 'register' :
        switch ($_GET['register']) {
            case '0' :
                echo 'Registration failed!';
                break;
            case '1' :
                echo 'Thank you for registering.';
                break;
        }
        break;
    default :
        echo 'Some other message';
        break;
}

I'm not sure if switch case can be used on associative arrays. What am I doing wrong? Cheers!

回答1:

You have to enclose the switch in a foreach() loop.

foreach ($_GET as $key => $value) {
    switch ($key) {
        case 'login' :
            switch ($value) {
                case '0' :
                    echo 'Login failed!';
                    break;
                case '1' :
                    echo 'Login successful.';
                    break;
            }
            break;
        case 'register' :
            switch ($value) {
                case '0' :
                    echo 'Registration failed!';
                    break;
                case '1' :
                    echo 'Thank you for registering.';
                    break;
            }
            break;
        default :
            echo 'Some other message';
            break;
    }
}

回答2:

I do not think it will work like this, $_get will return an array and these comparisons will not work. Switch statements need to evaluate to a constant.

回答3:

Just Use this:

switch($_GET['key']) //it will return you value of particular parameter.
case 'value1':
//write your statement here.
break;
case 'value2':
//write your statement here.
break;
//and so on

来源：https://stackoverflow.com/questions/16650446/php-switch-case-gets-variables-and-switch-case-gets-variables-values

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switch-statement