PHP数组反转的常见错误及其解决方法

$array = ['a', 'b', 'c', 'd'];

// 错误：未使用 Array Notation
$new_array = array_reverse($array);

echo join(', ', $new_array); // 输出：c, b, a, d

$new_array = array_reverse($array, true);

echo join(', ', $new_array); // 输出：d, c, b, a

$array = ['name' => 'John', 'age' => 30, 'city' => 'London'];

// 错误：尝试反转关联数组
$new_array = array_reverse($array);

echo join(', ', $new_array); // 输出：London, 30, John

$new_array = array_reverse(array_flip($array));

echo join(', ', $new_array); // 输出：John, London, 30

$array = [];

// 错误：对空数组反转
$new_array = array_reverse($array);

echo join(', ', $new_array); // 输出："Notice: array_reverse() expects parameter 1 to be array, null given in ..."

if (! empty($array)) {
    $new_array = array_reverse($array);
}

$log = [
    ['date' => '2023-02-15'],
    ['date' => '2023-02-14'],
    ['date' => '2023-02-13'],
];

$reversed_log = array_reverse($log, true);