PHP中数组的键

如何在PHP中仅从数组中获取密钥 例如，我有如下数组

<?php
$array = array(
    "one" => 1,
    "two" => 2,
    "three" => 3,
    "four" => 4
);

<?php
$array = array(
    "one",
    "two",
    "three",
    "four"
);
?>

---

您可以使用简单的

数组\u键

PHP函数

print_r(array_keys($array));

或

输出

  Array
(
    [0] => one
    [1] => two
    [2] => three
    [3] => four
)

---

您应该使用php数组键函数：-

$array = array(0 => 100, "color" => "red");
print_r(array_keys($array));

输出：

Array
(
    [0] => 0
    [1] => color
)

参考链接：--

可能重复的

Array
(
    [0] => 0
    [1] => color
)