What is the function of the "usort" method in PHP and how can it be used for sorting arrays of objects?

The "usort" method in PHP is used to sort an array using a user-defined comparison function. This is useful when sorting arrays of objects based on a custom criteria that cannot be achieved with standard sorting functions. By defining a callback function that compares the objects based on specific properties, we can use "usort" to sort the array accordingly. 

// Define a custom comparison function to sort objects based on a specific property
function compareObjects($a, $b) {
    return $a->property - $b->property;
}

// Create an array of objects
$objects = [
    (object)['property' => 2],
    (object)['property' => 1],
    (object)['property' => 3]
];

// Sort the array of objects using the custom comparison function
usort($objects, 'compareObjects');

// Output the sorted array of objects
print_r($objects);

Keywords

usort PHP sorting arrays objects

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