PHP get index of last inserted item in array

Question

It\'s as easy as the title sounds; I need to get the index/key of the last inserted item. Why is this difficult? See the following two code samples:

$a=array         


        

Answer 1

You can use key($a) together with end($a)

$a=array();
$a[]='aaa'; foo($a);
$a[3]='bbb'; foo($a);
$a['foo']='ccc'; foo($a);
$a[]='ffffd'; foo($a);

function foo(array $a) {
  end($a);
  echo 'count: ', count($a), ' last key: ', key($a), "\n";
}

prints

count: 1 last key: 0
count: 2 last key: 3
count: 3 last key: foo
count: 4 last key: 4