The array_diff_assoc() Function

The array_diff_assoc() function compares the keys and values of two or more arrays. It returns a new array containing elements from the first array that do not match in the other arrays by either key or value. This is crucial when we want to detect changes in structured data.

EXAMPLE

// We have current sensor settings and new settings from a form
$current_settings = [
    "location" => "Living Room",
    "interval" => 60,
    "unit" => "Celsius",
    "active" => true
];

$new_settings = [
    "location" => "Living Room",
    "interval" => 30, // Changed value
    "unit" => "Celsius",
    "note" => "Urgent" // New key
];

// Find differences: what in current settings is different or missing in the new ones
$differences = array_diff_assoc($current_settings, $new_settings);

if (!empty($differences)) {
    echo "Changes detected in the following parameters:\n";
    foreach ($differences as $key => $value) {
        echo "- Parameter $key has changed (old value: $value)\n";
    }
} else {
    echo "Settings are identical.";
}

RESULT

The result will be shown here...