Replace array values by $replacements key/value map in PHP [duplicate]

Question

I am having one (associative) data array $data with values, and another associative array $replacements.

I am looking for a short, easy and fast way to replace values in $data using the $replacements array.

The verbose way would be this:

function replace_array_values(array $data, array $replacements) {
  $result = [];
  foreach ($data as $k => $value) {
    if (array_key_exists($value, $replacements)) {
      $value = $replacements[$value];
    }
    $result[$k] = $value;
  }
  return $result;
}

Is there a native way to do this?

I know array_map(), but maybe there is something faster, without an extra function call per item?

Example:

See https://3v4l.org/g0sIJ

$data = array(
  'a' => 'A',
  'b' => 'B',
  'c' => 'C',
  'd' => 'D',
);

$replacements = array(
  'B' => '(B)',
  'D' => '(D)',
);

$expected_result = array(
  'a' => 'A',
  'b' => '(B)',
  'c' => 'C',
  'd' => '(D)',
);

assert($expected_result === replace_array_values($data, $replacements));

Can you show an example of $data, $replacements and expected output? — Lawrence Cherone
– Lawrence Cherone, Commented Mar 19, 2018 at 0:38

Jeto · Accepted Answer · 2018-03-19 00:32:37Z

2

The simplest/least verbose way I can think of:

return array_map(function($value) use ($replacements) {
  return array_key_exists($value, $replacements) ? $replacements[$value] : $value;
}, $data);

Using array_map is basically just looping over the array, which any other base function would also have to do anyway.

answered Mar 19, 2018 at 0:32

Jeto

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4 Comments

donquixote Over a year ago

array_map() calls a function for each iteration, which adds some overhead (would be curious how much). It is still a correct answer though.

Jeto Over a year ago

@donquixote I doubt this would be significant at all, but I may be wrong. Maybe you can run some benchmarks.

donquixote Over a year ago

If you have a data-crunching algorithm where this is called a lot, then I bet it will be significant.

donquixote Over a year ago

Or if the array is really big.

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