Php – Making sure a PHP array has only sequential keys

arraysMySQLPHP

Is there any way to have an array with items like:

$array[1];
$array[3];
$array[4];

Be turned into an array like this:

$array[1];
$array[2];
$array[3];

So that the array has only sequential numeric keys? Thanks!

-iMaster

Best Answer

array_values() returns all the values from the input array and indexes numerically the array.

Related Solutions

Java – Create ArrayList from array

new ArrayList<>(Arrays.asList(array));

Php – How to check if PHP array is associative or sequential

You have asked two questions that are not quite equivalent:

Firstly, how to determine whether an array has only numeric keys
Secondly, how to determine whether an array has sequential numeric keys, starting from 0

Consider which of these behaviours you actually need. (It may be that either will do for your purposes.)

The first question (simply checking that all keys are numeric) is answered well by Captain kurO.

For the second question (checking whether the array is zero-indexed and sequential), you can use the following function:

function isAssoc(array $arr)
{
    if (array() === $arr) return false;
    return array_keys($arr) !== range(0, count($arr) - 1);
}

var_dump(isAssoc(['a', 'b', 'c'])); // false
var_dump(isAssoc(["0" => 'a', "1" => 'b', "2" => 'c'])); // false
var_dump(isAssoc(["1" => 'a', "0" => 'b', "2" => 'c'])); // true
var_dump(isAssoc(["a" => 'a', "b" => 'b', "c" => 'c'])); // true

Best Answer

Related Solutions

Java – Create ArrayList from array

Php – How to check if PHP array is associative or sequential

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