一道很纠结的php面试题
$a = 1;
$b = 'a';
$a = $b++;
//$a = 'a'
//$b = 'b'
$b = $a++;
//$b = 'a'
//$a = 'b'
$c = set($a).$b;
//$c = 3.'a'
//$c = 3a
echo $c;
function set($a=2,$b=3){
global $a;
//$a = 'b'
$c = &$a;
$a += $b++;
//$a = 'b' + 3
//$a = 3
//$c = 3
return $c;
}
![[Web-Frontend] Node.js-Schnellstart](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
