How Does PHP\'s array_column() Function Extract Columns of Object Properties?

Retrieving Object Property Arrays in PHP

When dealing with arrays of objects, it can be necessary to extract specific columns of properties for further processing. This article explores a concise method for extracting these columns in a single line using the array_column() function.

Array of Objects

Consider the following array of cat objects:

<code class="php">$cats = [
    (object)['id' => 15],
    (object)['id' => 18],
    (object)['id' => 23]
];</code>

array_column() Function

To extract the column of IDs from these objects, we can leverage the array_column() function. Introduced in PHP 7.0, this function provides a convenient way to retrieve columns of properties from arrays of objects or arrays.

Usage

To use array_column(), we specify the input array as the first parameter and the desired property name as the second parameter. For instance, to extract the IDs from our $cats array, we would use:

<code class="php">$idCats = array_column($cats, 'id');</code>

The result would be an array containing the IDs of the cats:

<code class="php">[15, 18, 23]</code>

Note for PHP Versions Prior to 7.0

If you are using PHP versions prior to 7.0, array_column() is not available. Alternative approaches such as array_walk() or a custom function can be used for property extraction.

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