How to Sort an Array of Associative Arrays in PHP by Column Value?

Sorting an Array of Associative Arrays by Column Value

Sorting an array of associative arrays by a specific column value can be achieved using the array_multisort() function. This function takes multiple arrays and sorts them by one or more columns.

Consider the following array that represents an inventory list:

$inventory = array(
    array("type" => "fruit", "price" => 3.50),
    array("type" => "milk", "price" => 2.90),
    array("type" => "pork", "price" => 5.43)
);

To sort this array by the "price" column, we can use the following code:

$price = array();
foreach ($inventory as $key => $row) {
    $price[$key] = $row['price'];
}
array_multisort($price, SORT_DESC, $inventory);

In PHP 5.5.0 and later, we can simplify the above code using the array_column() function:

$price = array_column($inventory, 'price');
array_multisort($price, SORT_DESC, $inventory);

This will sort the $inventory array by the "price" column in descending order. The resulting array will be:

$inventory = array(
    array("type" => "pork", "price" => 5.43),
    array("type" => "fruit", "price" => 3.50),
    array("type" => "milk", "price" => 2.90)
);

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