Question

I have a sample code:

$array1 = ("key1", "key3");
$array2 = ("value1", "value3");
$array = array_combine($array1, $array2);
if(!isset($array["key2"])) {
   $array["key2"] = "value2";
} 

But result is error, how to fix it

array("key1"=>"value1", "key2"=>"value2", "key3"=>"value3");

Answer 1

You’ll have to specify that you wish that the arguments currently assigned to $array1 and $array2 are to be used as arrays.

$array1 = array ("key1", "key3");
$array2 = array ("value1", "value3");

---

Full example

$array1 = array ("key1",     "key3");
$array2 = array ("value1", "value3");

$array  = array_combine($array1, $array2);

if(!isset($array["key2"])) {
  $array["key2"] = "value2";
} 

print_r ($array);

Array
(
    [key1] => value1
    [key3] => value3
    [key2] => value2
)