How Can I Flatten a Multidimensional Array in PHP?

Converting Multidimensional Arrays to One Dimension

Encounters with arrays containing single-element subarrays are common, and transforming them into a one-dimensional structure becomes necessary. Imagine an array like:

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

Our goal is to reshape this into:

[88868, 88867, 88869, 88870]

Built-in PHP Conversion Techniques

PHP offers two native solutions:

• array_map('current', $array): Retrieves the first element of each subarray, providing a one-dimensional output.
• call_user_func_array('array_merge', $array): Merges all the subarrays into a single array, achieving the same result.

For the provided example, both techniques yield the desired output efficiently. However, when dealing with subarrays containing multiple values, the array_map approach may become inadequate. In such cases, call_user_func_array proves more versatile, accommodating subarrays with varying lengths.

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