How to Flatten Multidimensional Arrays in PHP Using Built-in Functions?

Flattening Multidimensional Arrays with PHP's Built-In Functions

Converting multidimensional arrays into one-dimensional arrays is a common task in programming. In PHP, there are several ways to achieve this, using both built-in functions and custom logic.

For arrays containing single-element subarrays, like the example provided:

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

PHP's array_map() function can be employed to extract the single elements into a new one-dimensional array:

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

The array_map() function applies a callback function to each element of an array. In this case, the current() function is used as the callback, which simply returns the current element of the innermost array.

For more general cases, where subarrays may have multiple elements, call_user_func_array() can be utilized:

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

call_user_func_array() calls a function with a variable number of arguments, passed as an array. In this case, we pass the multidimensional array as the argument to array_merge(), which merges all the subarrays into a single one-dimensional array.

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