function sortByAge($a, $b) {
return $a['age'] > $b['age'];
}
$people=[
["age"=>54,"first_name"=>"Bob","last_name"=>"Dillion"],
["age"=>22,"first_name"=>"Sarah","last_name"=>"Harvard"],
["age"=>31,"first_name"=>"Chuck","last_name"=>"Bartowski"]
];
usort($people, 'sortByAge'); //$people is now sorted by age (ascending)$inventory = array(
array("type"=>"Fruit", "price"=>3.50),
array("type"=>"milk", "price"=>2.90),
array("type"=>"Pork", "price"=>5.43),
);
$prices = array_column($inventory, 'price');
$inventory_prices = array_multisort($prices, SORT_DESC, $inventory);
$types = array_map(strtolower, array_column($inventory, 'type'));
$inventory_types = array_multisort($types, SORT_ASC, $inventory);array_multisort(array_map(function($element) {
return $element['order'];
}, $array), SORT_ASC, $array);
print_r($array); $keys = array_column($array, 'Price');
array_multisort($keys, SORT_ASC, $array);
print_r($array);$people= array(
array("age"=>54,"first_name"=>"bob","last_name"=>"Dillion"),
array("age"=>22,"first_name"=>"darah","last_name"=>"Harvard"),
array("age"=>31,"first_name"=>"ahuck","last_name"=>"Bartowski"),
);
echo '<PRE>';
print_r($people);
$keys = array_column($people, 'first_name');
print_r($keys);
array_multisort($keys, SORT_ASC, $people);
print_r($people);// PHP 7+
usort($arr, function ($a, $b) {
return $a['key'] <=> $b['key'];
});