How can dynamic sorting based on multiple columns be achieved in PHP, especially when dealing with special characters like umlauts?

When sorting based on multiple columns in PHP, especially when dealing with special characters like umlauts, it is important to use a custom sorting function that takes into account the specific requirements for sorting these characters. One way to achieve dynamic sorting based on multiple columns is to use the `usort()` function along with a custom comparison function that considers the special characters and their sorting order. 

// Sample array of data to be sorted
$data = [
    ['name' => 'Müller', 'age' => 30],
    ['name' => 'Schmidt', 'age' => 25],
    ['name' => 'Müller', 'age' => 28],
];

// Custom comparison function for sorting based on multiple columns
usort($data, function($a, $b) {
    $nameComparison = strcoll($a['name'], $b['name']); // Compare names using strcoll to handle special characters
    if ($nameComparison != 0) {
        return $nameComparison;
    }
    return $a['age'] - $b['age']; // If names are equal, sort by age
});

// Output sorted data
print_r($data);

Keywords

PHP dynamic sorting multiple columns special characters umlauts

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