php - “break 2”是什么意思？

我经常使用和看到带有“break”的示例。这是什么意思:

 <?php
    while ($flavor = "chocolate") {
      switch ($flavor) {
        case "strawberry";
            echo "Strawberry is stock!";
            break 2;    // Exits the switch and the while
        case "vanilla";
            echo "Vanilla is in stock!";
            break 2;   // Exits the switch and the while
        case "chocolate";
            echo "Chocolate is in stock!";
            break 2;    // Exits the switch and the while
        default;
            echo "Sorry $flavor is not in stock";
            break 2;    // Exits the switch and the while
      }
    }
    ?>

'break'语句是否还有更多可用选项？

最佳答案

从PHP docs on break :



如注释中所指出的，它脱离了开关。

以下示例将打破所有foreach循环:

foreach (...) {
  foreach (..) {
    foreach (...) {
      if ($condition) {
        break 3;
      }
    }
  }
}