带有 foreach 循环的简单开关盒

Question

我有以下 PHP。

最终，我希望我在执行结束时的输出是：

Size1Size3

$footballTypes = "1,3";

$footballTypeNames = "";

foreach ( $footballTypes as $data ) {

    switch ($data) {

      case 1:

        $footballTypeNames .= "Size 1";

      case 2:

        $footballTypeNames .= "Size 2";

      case 3:

        $footballTypeNames .= "Size 3";

    }

}

echo $footballTypeNames;

但是，现在，我收到错误消息：

Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\football.php on line 7

我哪里错了？

Answer 1

使用爆炸配合，$footballTypes     = explode(",", "1,3"); // here I explode$footballTypeNames = "";foreach ($footballTypes as $data) {    switch ($data) {        case 1:            $footballTypeNames .= "Size 1";break;        case 2:            $footballTypeNames .= "Size 2";break;        case 3:            $footballTypeNames .= "Size 3";break;    }}echo $footballTypeNames;如果你没问题，有多种方法可以实现这一点，1。$footballTypes     = explode(",", "1,3"); // here I explode$temp = implode("",array_map(function($value){    return "Size $value";}, $footballTypes));print_r($temp);

Answer 2

您不需要 switch，因为您添加的文本Size只是 . 使用爆炸和内爆..implode() 函数从数组元素返回一个字符串。 语法：内爆（分隔符，数组）explode() 函数将一个字符串分解成一个数组。语法：explode(separator,string,limit)$footballTypes = "1,2,3";$footballTypeNames = implode('Size ', explode(',',$footballTypes));echo 'Size '.$footballTypeNames;