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

How to Determine Minimum and Maximum Values in a Multidimensional PHP Array

In PHP, extracting minimal and maximal values from an array is a straightforward task. To illustrate this, consider the following example:

<code class="php">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>

Option 1: Using Array Functions

Utilize the array_column() function to extract the 'Weight' values:

<code class="php">$weights = array_column($array, 'Weight');</code>

Subsequently, determine the minimum and maximum values:

<code class="php">$minValue = min($weights);
$maxValue = max($weights);</code>

Option 2: Using Array and Map Functions (PHP 5.5 or higher)

аналогичный Option 1, но использует array_map() для извлечения значений:

<code class="php">$weights = array_map(function($row) { return $row['Weight']; }, $array);

$minValue = min($weights);
$maxValue = max($weights);</code>

Option 4: Using Array Reduce for Minimum or Maximum Calculations

For efficiency, use array_reduce() if only minimal or maximal value is required:

<code class="php">$minValue = array_reduce($array, function($minimum, $current) {
    return min($minimum, $current['Weight']);
}, PHP_INT_MAX);</code>

The array_reduce() performs fewer min() operations, making it potentially faster. PHP_INT_MAX represents the initial high value to start the reduction.

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