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;