What is the best way to merge keys from multiple arrays in PHP and calculate the total count of unique keys?

To merge keys from multiple arrays in PHP and calculate the total count of unique keys, you can use the `array_merge` function to combine the arrays and then use the `array_unique` function to get only the unique keys. Finally, you can use the `count` function to calculate the total count of unique keys. 

// Arrays to merge
$array1 = array('key1' => 1, 'key2' => 2);
$array2 = array('key2' => 3, 'key3' => 4);

// Merge arrays
$mergedArray = array_merge($array1, $array2);

// Get unique keys
$uniqueKeys = array_unique(array_keys($mergedArray));

// Calculate total count of unique keys
$totalUniqueKeys = count($uniqueKeys);

echo $totalUniqueKeys; // Output: 3

Keywords

array_merge array_keys array_unique count PHP

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