php sort list of lists based on key value code example

Example 1: php sort array by key

$weight = [
    'Pete' => 75, 
    'Benjamin' => 89,
    'Jonathan' => 101
  ];  	
  ksort($weight);

Example 2: php sort array by specific key

usort($array, function ($a, $b) {
  return ($a['specific_key'] < $b['specific_key']) ? -1 : 1;
});