Question

How to call this function with url parameter

function test($str, $str_){

     if ($str == $str)
     echo "null";
     else
     echo "helloworld";
}

Answer 1

Use this:

switch($_GET['cmd']) {
case 'hello':
    test($_GET['cmd'],'second_parameter_value');
}

The problem is that you aren’t passing a value for the second parameter. I execute previous code and prints “helloworld”

Second part:

If your intention is to call the function using two parameters in the Url you can use the follow (I’m only modifying the important parts in your own initial code):

function test($str, $str_){

     if ($str == "null")
        echo "null";
     else
        echo "helloworld";
}

switch($_GET['cmd']) {
case 'hello':
    test($_GET['cmd'],$_GET['cmd2']);
}

and the Url to call this is: execute.php?cmd=hello&cmd2=hello2