How to Flatten a Multidimensional Array in PHP Using `array_column()`?

How to Convert Multidimensional Arrays into Single Arrays

Problem:

A multidimensional array is encountered with an unnecessary structure. The goal is to simplify it into a single-dimensional array, extracting only the desired values within the nested arrays.

Solution:

To convert a multidimensional array into a single-dimensional array, the array_column() function can be utilized. This function effectively extracts a specific column from a multidimensional array, conceptually similar to extracting a column from a table or matrix.

Implementation:

$array = array_column($array, 'plan');

Breakdown of the Script:

• $array: Represents the multidimensional array that needs conversion.

• array_column() function: This function takes two arguments:

  • The first argument is the multidimensional array to be transformed.
  • The second argument identifies the desired column or key to extract. In this case, it specifies 'plan' to retrieve the values for this key.

Example:

Using the provided multidimensional array:

$array = array(
    0 => array(
        'plan' => 'basic'
    ),
    1 => array(
        'plan' => 'small'
    ),
    2 => array(
        'plan' => 'novice'
    ),
    3 => array(
        'plan' => 'professional'
    ),
    4 => array(
        'plan' => 'master'
    ),
    5 => array(
        'plan' => 'promo'
    ),
    6 => array(
        'plan' => 'newplan'
    )
);

To convert it into a single-dimensional array, the following code can be used:

$newArray = array_column($array, 'plan');

The resulting $newArray will have the following structure:

Array(
    [0] => 'basic',
    [1] => 'small',
    [2] => 'novice',
    [3] => 'professional',
    [4] => 'master',
    [5] => 'promo',
    [6] => 'newplan'
)

Additional Information:

• For more details on the array_column() function, refer to the official PHP documentation.
• This solution assumes that all inner arrays have the same key structure. If that's not the case, additional processing might be necessary.

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