How to Find the Minimum and Maximum Values in a Multidimensional Array Using PHP?

Extracting Minimum and Maximum Values from a Multidimensional Array in PHP

Given an array with nested values, obtaining the minimum and maximum values for a specific key can be challenging. Consider the following example:

<code class="php">$array = array (
  0 =>
  array (
    'id' => '20110209172713',
    'Date' => '2011-02-09',
    'Weight' => '200',
  ),
  1 =>
  array (
    'id' => '20110209172747',
    'Date' => '2011-02-09',
    'Weight' => '180',
  ),
  2 =>
  array (
    'id' => '20110209172827',
    'Date' => '2011-02-09',
    'Weight' => '175',
  ),
  3 =>
  array (
    'id' => '20110211204433',
    'Date' => '2011-02-11',
    'Weight' => '195',
  ),
);</code>

To extract the minimum and maximum weights, several solutions exist:

Option 1:

• Map the array to extract the 'Weight' values into a new array ($numbers).
• Use min() and max() to find the minimum and maximum values.

<code class="php">$numbers = array_column($array, 'Weight');
$min_value = min($numbers);
$max_value = max($numbers);</code>

Option 2:

• For PHP versions below 5.5, use array_map() to extract the 'Weight' values.

<code class="php">$numbers = array_map(function($details) {
  return $details['Weight'];
}, $array);
$min_value = min($numbers);
$max_value = max($numbers);</code>

Option 4:

• If only the minimum or maximum value is needed, array_reduce() can be more efficient.

<code class="php">$min_value = array_reduce($array, function($min, $details) {
  return min($min, $details['Weight']);
}, PHP_INT_MAX);
$max_value = array_reduce($array, function($max, $details) {
  return max($max, $details['Weight']);
}, -PHP_INT_MAX);</code>

By employing these techniques, you can effectively retrieve the minimum and maximum values from a multidimensional array in PHP, helping you analyze and process data effectively.

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