VBA,先需要变量名称也是可变量。

2025-03-15 22:04:13
推荐回答(4个)
回答1:

$GLOBALS[$s][] = $row;

${$s}[] = $row;

楼主,麻烦你去下一个PHP手册看下吧。

可变变量
有时候使用可变变量名是很方便的。就是说,一个变量的变量名可以动态的设置和使用。一个普通的变量通过声明来设置,例如:
$a = 'hello';
?>
一个可变变量获取了一个普通变量的值作为这个可变变量的变量名。在上面的例子中 hello 使用了两个美元符号($)以后,就可以作为一个可变变量的变量了。例如:
$$a = 'world';
?>
这时,两个变量都被定义了:$a 的内容是“hello”并且 $hello 的内容是“world”。因此,可以表述为:
echo "$a ${$a}";
?>
以下写法更准确并且会输出同样的结果:
echo "$a $hello";
?>
它们都会输出:hello world。
要将可变变量用于数组,必须解决一个模棱两可的问题。这就是当写下 $$a[1] 时,解析器需要知道是想要 $a[1] 作为一个变量呢,还是想要 $$a 作为一个变量并取出该变量中索引为 [1] 的值。解决此问题的语法是,对第一种情况用 ${$a[1]},对第二种情况用 ${$a}[1]。

回答2:

回答3:

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回答4:

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