Question

我正在使用数组来存储在其他地方动态生成的其他数组的名称。我需要遍历“names”数组并访问“named”数组的内容。像这样：

$names = array("one", "two", "three");
$one = array("a", "b", "c");
$two = array("c", "d", "e");
$three = array("f", "g", "h");
foreach ($process_array in $names) {
    // how to access the contents of $one, $two and $three using only $names??
}

我确信我应该能够以某种方式利用变量变量，但我读过的所有例子都显示了我正在尝试做的逻辑逆转（除非我误解了基本原理 - 完全可能！）

非常感谢任何建议。

Answer 1

$names = array("one", "two", "three");
$one = array("a", "b", "c");
$two = array("c", "d", "e");
$three = array("f", "g", "h");
foreach ($names as $name) {
// how to access the contents of $one, $two and $three using only $names??
print_r(${$name});
}

Answer 2

PHP有一个名为variable variables的功能：

foreach ($names as $name) {
    $$name;
}

对于只是变量，您可以使用上面的语法（$$name）。如果要使用表达式命名变量，请使用括号语法，如${"foo".$name}。

Answer 3

喜欢这个吗？

foreach ($names as $name) {
    var_dump($$name); // do something else
}

Answer 4

$names = array("one", "two", "three");
$one = array("a", "b", "c");
$two = array("c", "d", "e");
$three = array("f", "g", "h");

foreach ($names as $name) {
  foreach ($$name as $value) {
    // $value contains the array values.
  }
}

要注意它是foreach ($array as $value)，而不是foreach ($value in $array)。

逆变量变量？

4 个答案: