PHP 变量范围 - 在 foreach 循环中设置全局变量

Question

I am new-ish to PHP have read the PHP Variable scope docs and other Stackoverflow threads and can't get my head around why setting a global var inside a foreach loop doesn't work:

if (isset($regionsArr) && $page == 'regions') {
  $param = htmlspecialchars($_GET["region"]);
  foreach ($regionsArr as $item) {
    if ($item['region'] == $param) {
      global $curRegion;
      $curRegion = $item;
      echo $GLOBALS["curRegion"]["name"]; // works
    } else {
      $curRegion = null;
    }
  }
}
if (isset($GLOBALS["curRegion"])) {
  echo $GLOBALS["curRegion"]["name"]; // does not work
}

Answer 1

Thanks to @lawrencecherone for pointing out that I need to break; out of the loop.

Without the brake, the loop continues and overrides $curRegion with null after it is successfully set in the loop.

Note: if by stroke of luck your matched $item happened to be the very last item in the loop, then it wouldn't get overridden, but... yeah... just add break;

foreach ($regionsArr as $item) {
  if ($item['region'] == $param) {
    $curRegion = $item;
    break; // this kills the loop after $item['region'] matches $param
  } else {
    $curRegion = null;
  }
}