[PHP-NOTES] note 130634 added to function.array-diff-assoc

Handy function to compare value changes between arrays, based on array_diff_assoc().
Valid for PHP 7.4+ due to the use of arrow functions as a shorthand, but may be "downgraded" as well.

<?php

function array_changes($amDataOld, $amDataNew)
{
    $fnDiffGroup = fn ($sDiffKey) => [
        'old' => ($amDataOld[$sDiffKey] ?? NULL),
        'new' => ($amDataNew[$sDiffKey] ?? NULL),
    ];

	$asDataOld  = array_map('serialize', $amDataOld);
    $asDataNew  = array_map('serialize', $amDataNew);
    $asDiffKeys = array_keys(
            array_diff_assoc($asDataOld, $asDataNew)
        +   array_diff_assoc($asDataNew, $asDataOld)
    );
    
    return array_combine($asDiffKeys, array_map($fnDiffGroup, $asDiffKeys));
}

$a1 = [
    'SameValue'       => 230.0,
    'SameArray'       => ['foo' => 'FOO', 'bar' => 'BAR'],
    'DiffValue'       => 48.25,
    'DiffTypeSimple'  => 100.1,
    'DiffTypeComplex' => 27.8,
    'DiffTypeArray'   => ['foo' => 'FOO', 'bar' => 'BAR'],
];
$a2 = [
    'SameValue'       => 230.0,
    'SameArray'       => ['foo' => 'FOO', 'bar' => 'BAR'],
    'DiffValue'       => 41.5,
    'DiffTypeSimple'  => '100.1',
    'DiffTypeComplex' => ['foo' => 'FOO', 'bar' => 'BAZ'],
    'DiffTypeArray'   => ['foo' => 'FOO', 'bar' => 'BAZ'],
];

var_dump(array_changes($a1, $a2));

?>
----
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Manual Page -- https://php.net/manual/en/function.array-diff-assoc.php
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