在PHP中循环遍历5维数组

// 定义一个5维数组
$array = [
    [
        [
            [
                ['a', 'b', 'c'],
                ['d', 'e', 'f']
            ],
            [
                ['g', 'h', 'i'],
                ['j', 'k', 'l']
            ]
        ],
        [
            [
                ['m', 'n', 'o'],
                ['p', 'q', 'r']
            ],
            [
                ['s', 't', 'u'],
                ['v', 'w', 'x']
            ]
        ]
    ],
    [
        [
            [
                ['y', 'z'],
                ['1', '2']
            ],
            [
                ['3', '4'],
                ['5', '6']
            ]
        ],
        [
            [
                ['7', '8'],
                ['9', '0']
            ],
            [
                ['!', '@'],
                ['#', '$']
            ]
        ]
    ]
];

// 使用多层嵌套的循环遍历5维数组
foreach ($array as $level1) {
    foreach ($level1 as $level2) {
        foreach ($level2 as $level3) {
            foreach ($level3 as $level4) {
                foreach ($level4 as $value) {
                    echo $value . ' ';
                }
            }
        }
    }
}