<?php
$array = [
['customerName' => "John Dunk",
'customerPhone' => '5555555555',
'Difference' => 125.0],
['customerName' => "John Dunk",
'customerPhone' => '5555555555',
'Difference' => 192.0],
['customerName' => "John X",
'customerPhone' => '5555555555',
'Difference' => 225.0],
['customerName' => "John X",
'customerPhone' => '5555555555',
'Difference' => 1.0]];
array_multisort(array_column($array, 'Difference'), SORT_DESC, $array);
$result = array_column($array, null, 'customerName');
print_r($result);
preferences:
70.54 ms | 402 KiB | 5 Q