How to Efficiently Prefix Array Keys in PHP: A Guide to the Fastest Methods

Prefixing Array Keys: Exploring the Fastest Approach

The challenge of efficiently prepending a string to array keys has garnered significant attention among programmers. The most optimal method varies slightly depending on the PHP version you are utilizing.

Arrays with Flat Structure

For flat arrays, the following options are recommended:

• PHP 7.4 : Leverage arrow functions for brevity and efficiency:

  <code class="php">$prefix = "prefix";
  $array = array_combine(
    array_map(fn($k) => "$prefix$k", array_keys($array)),
    $array
  );</code>

• PHP Prior to 5.3: Employ a custom class for dynamic key prefixing:

  <code class="php">$prefix = "prefix";
  $prefixer = new KeyPrefixer($prefix);
  $array = $prefixer->mapArray($array);</code>

Arrays with Arbitrary Depth

When dealing with arrays of arbitrary depth, consider the following:

• PHP 5.3 and Higher: Use the recursive mapArray function to traverse the array and apply the prefix recursively to all sub-arrays and values:

  <code class="php">$prefix = "prefix";
  function mapArray($array, $prefix) {
  if (is_array($array)) {
    return array_map(function($v) use ($prefix) { return mapArray($v, $prefix); }, $array);
  } else {
    return $prefix . $array;
  }
  }</code>

By understanding the variations and selecting the most appropriate approach based on your PHP version and array structure, you can efficiently add prefixes to array keys and enhance the readability and organization of your data.

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