Question

I have an array: $categories = array("item1", "item2", "item3");
I also have three arrays: $item1Array = array("hi", "items");, $item2Array = array("hi", "items");, $item3Array = array("hi", "items");
I stated a foreach like this:

foreach ($categories as &$value) {
    echo "<optgroup label='" . $value . "'>';
    $nextArray = $value . "Array";
    foreach($nextArray as &$nextValue) {
        echo "<option value='" . $nextValue . "'>" . $nextValue . "</option>";
    }
}

but it get an error Warning: invalid argument supplied for foreach().
Is there a way I can achieve this?

Answer 1

Of course, but as you can clearly see from the syntax highlighting of your post, you used a ' instead of a " at the end of the “optgroup” line.

Also, you could just use a nested array:

$categories = Array(
  "item1"=>Array("hi","items"),
  "item2"=>Array("hi","items"),
  "item3"=>Array("hi","items"),
);
foreach($categories as $key=>$array) {
  echo "<optgroup label='".$key."'>";
  foreach($array as $value) {
    echo "<option>".$value."</option>";
  }
  echo "</optgroup>";
}