如何检查多个变量并初始化非空变量？

Question

I have a form with multiple inputs for one value which have similar names. something like this:

isset($_GET['name1'])
isset($_GET['name2'])
isset($_GET['name3'])

Always, either only one of them is true or none of them. And here is my code:

$name = '';
if( isset($_GET['name1']) ){
    $name = $_GET['name1'];
} else if ( isset($_GET['name2']) ) {
    $name = $_GET['name2'];
} else if ( isset($_GET['name3']) ) {
    $name = $_GET['name3'];
}

echo $name;

My code works as well. But I guess I can do that without those conditions. Any idea how can I write that logic more clean?

Answer 1

You can use a loop:

for ($i = 1; $i <= 3; $i++) {
    if (isset($_GET["name$i"])) {
        $name = $_GET["name$i"];
        break;
    }
}

Using the PHP 7 coalescing operator, you can write:

$name = $_GET["name1"] ?? $_GET["name2"] ?? $_GET["name3"] ?? "";