is_array

Please note that the 'cast to array' check is horrendously out of date.

Running that code against PHP 5.6 results in this:

is_array  :  0.93975400924683
cast, === :  1.2425191402435

So, please use 'is_array', not the horrible casting hack.

Or you could make use of the array_diff_key and array_key function:

<?php

function is_assoc($var)
{
        return is_array($var) && array_diff_key($var,array_keys(array_keys($var)));
}

function test($var)
{
        echo is_assoc($var) ? "I'm an assoc array.\n" : "I'm not an assoc array.\n";
}

// an assoc array
$a = array("a"=>"aaa","b"=>1,"c"=>true);
test($a);

// an array
$b = array_values($a);
test($b);

// an object
$c = (object)$a;
test($c);

// other types
test($a->a);
test($a->b);
test($a->c);

?>

The above code outputs:
I'm an assoc array.
I'm not an assoc array.
I'm not an assoc array.
I'm not an assoc array.
I'm not an assoc array.
I'm not an assoc array.

hperrin's results have indeed changed in PHP 7. The opposite is now true, is_array is faster than comparison:

is_array  :  0.52148389816284
cast, === :  0.84179711341858

Tested 1000000 iterations.

Yet another simpler, faster is_assoc():

<?php
function is_assoc($array) {
  foreach (array_keys($array) as $k => $v) {
    if ($k !== $v)
      return true;
  }
  return false;
}
?>

In my tests it runs about twice as fast as Michael/Gabriel's array_reduce() method.

(Speaking of which: Gabriel's version doesn't work as written; it reports associative arrays as numeric if only the first key is non-numeric, or if the keys are numeric but ordered backwards.  Michael solves this problem by comparing array_reduce() to count(), but that costs another function call; it also works to just compare to -1 instead of 0, and therefore return -1 as the ternary else from the callback).

alex frase's example is fast but elanthis at awesomeplay dot com's example is faster and Ilgar's modification of alex's code is faulty (the part " || $_array[$k] !== $v"). Also, Ilgar's suggestion of giving a false return value when the variable isnt an array is not suitable in my opinion and i think checking if the array is empty would also be a suitable check before the rest of the code runs.

So here's the modified (is_vector) version

<?php
function is_vector( &$array ) {
   if ( !