Checking if array is multidimensional or not?

Question

1. What is the most efficient way to check if an array is a flat array of primitive values or if it is a multidimensional array?

Answer 1

Try as follows

if (count($arrayList) != count($arrayList, COUNT_RECURSIVE)) 
{
  echo 'arrayList is multidimensional';

}else{

  echo 'arrayList is no multidimensional';
}

Answer 2

Even this works

is_array(current($array));

If false its a single dimension array if true its a multi dimension array.

current will give you the first element of your array and check if the first element is an array or not by is_array function.

Answer 3

For PHP 4.2.0 or newer:

function is_multi($array) {
    return (count($array) != count($array, 1));
}

Answer 4

Its as simple as

$isMulti = !empty(array_filter($array, function($e) {
                    return is_array($e);
                }));

Answer 5

if($array[0]){
//enter your code 
}

Answer 6

All great answers... here's my three lines that I'm always using

function isMultiArray($a){
    foreach($a as $v) if(is_array($v)) return TRUE;
    return FALSE;
}