How to Find the Maximum Value in a Specific Column of a Multidimensional PHP Array?

Finding the Maximum Value in Multidimensional PHP Arrays

When working with multidimensional arrays in PHP, it can be challenging to retrieve the element with the highest value for a specific key. Unlike one-dimensional arrays, the native max() function is insufficient for this task.

Using the array_column Function

From PHP 5.5 onwards, PHP introduced the array_column() function, which allows you to extract values from a particular key in a multidimensional array. This provides an efficient way to find the maximum value for a specific column:

$maxTotal = max(array_column($array, 'Total'));

This will return the maximum value of the 'Total' key in the given array.

Additional Considerations

After finding the maximum value, you may need to retrieve the rest of the data associated with that maximum. To do this, you can iterate through the original array and compare the 'Total' values:

$result = null;
foreach ($array as $data) {
    if ($data['Total'] === $maxTotal) {
        $result = $data;
        break; // Found the maximum, stop iterating
    }
}

Example

Consider the provided array:

$array = array(
    array(
        'Key1' => 'Key1',
        'Total' => 13
    ),
    array(
        'Key2' => 'Key2',
        'Total' => 117
    ),
    array(
        'Key3' => 'Key3',
        'Total' => 39
    )
);

Using the array_column() function:

$maxTotal = max(array_column($array, 'Total')); // 117

Retrieving the associated data:

$result = null;
foreach ($array as $data) {
    if ($data['Total'] === $maxTotal) {
        $result = $data;
    }
}

print_r($result); // {'Key2' => 'Key2', 'Total' => 117}

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