How to Flatten Arrays with Nested Single-Element Subarrays in PHP?

Flattening Arrays with Nested Single-Element Subarrays

In PHP, you may encounter arrays containing single-element subarrays. Converting these multidimensional arrays to one-dimensional arrays becomes essential for certain tasks.

Example Array:

$array = [[88868], [88867], [88869], [88870]];

Desired Output:

[88868, 88867, 88869, 88870]

To achieve this conversion, consider the following methods:

1. Using array_map with current():

   • This is suitable for arrays where each subarray contains only one element. It iterates through the subarrays and extracts the single element using the current() function.

   $oneDimensionalArray = array_map('current', $array);

2. Using call_user_func_array with array_merge():

   • This approach is more versatile and can handle subarrays with multiple elements. It uses call_user_func_array to pass the two-dimensional array as separate arguments to array_merge, effectively combining them into a one-dimensional array.

   $oneDimensionalArray = call_user_func_array('array_merge', $array);

Choose the appropriate method based on the structure and complexity of your array. These techniques provide efficient ways to flatten arrays with nested single-element subarrays, enabling further data manipulation and processing.

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