如何实现多维数组内爆？循环获取的数组需转为指定格式字符串

Got it, let's break down how to turn those nested arrays into the string format you need. Here's a straightforward approach using PHP's built-in functions:

Step-by-Step Explanation #

1. Extract the inner array: Each of your input arrays has a single outer element, which is the actual array of values we need to join (e.g., [[4]] → inner array is [4]).
2. Join inner array elements with "-": Use implode('-', $innerArray) to turn each inner array into a hyphen-separated string.
3. Collect all parts and join with spaces: Gather all the hyphenated strings, then join them with spaces to get the final output.

Code Example #

Case 1: All arrays are stored in a single parent array #

If you have all your target arrays in one big array, use this loop:

// Your input arrays grouped into a parent array
$inputArrays = [
    [[4]],
    [[3, 4]],
    [[1, 2, 30, 43, 65, 53, 634]]
];

$resultParts = [];

foreach ($inputArrays as $arr) {
    // Grab the inner array (the first element of the outer array)
    $innerValues = $arr[0];
    // Join inner values with "-"
    $resultParts[] = implode('-', $innerValues);
}

// Join all parts with spaces to get the final string
$finalOutput = implode(' ', $resultParts);

echo $finalOutput; // Output: 4 3-4 1-2-30-43-65-53-634

Case 2: Arrays are fetched one by one in a loop #

If you're getting each array individually (e.g., from a database query loop), process them on the fly:

$resultParts = [];

// Example: First array fetched
$currentArray = [[4]];
$resultParts[] = implode('-', $currentArray[0]);

// Example: Second array fetched
$currentArray = [[3, 4]];
$resultParts[] = implode('-', $currentArray[0]);

// Example: Third array fetched
$currentArray = [[1, 2, 30, 43, 65, 53, 634]];
$resultParts[] = implode('-', $currentArray[0]);

// Repeat for subsequent arrays...

$finalOutput = implode(' ', $resultParts);
echo $finalOutput;

Safety Tip #

If there's any chance your array structure might vary (e.g., outer array has no elements), add a quick check to avoid errors:

foreach ($inputArrays as $arr) {
    if (isset($arr[0]) && is_array($arr[0])) {
        $resultParts[] = implode('-', $arr[0]);
    }
}

内容的提问来源于stack exchange，提问作者MagicHat