array_combine removed duplicate array

Question

Array_combine remove duplicate array

    <?php
        $a1=array("red","red");
        $a2=array("blue","yellow");
        print_r(array_combine($a1,$a2));
    ?>

This code give output : Array ( [red] => yellow )

But I want output like this: Array ( [red] => blue [red] => yellow )

Answer 1

The Andreas answer is correct. you can do this:

$a1 = ['red'];
$a2 = ['blue', 'yellow'];
$a3 = [];
foreach($a1 as $item1) {
  foreach($a2 as $item2) {
    $a3[$item1][] = $item2;
  }
}

print_r($a3);

The output:

array(1) {
  ["red"]=>
  array(2) {
    [0]=>
    string(4) "blue"
    [1]=>
    string(6) "yellow"
  }
}