how iterate ArrayCollection in symfony2 Controller

Definitely agree one shouldn't convert to an array, however, ->getIterator() isn't necessary.

foreach($arrayCollection as $i => $item) {
    //do things with $item
}

Simplest way:

$arr = $arrayCollectionInc->toArray();

foreach ($arr as $Inc) {

}

Working example:

$a = new ArrayCollection();
$a->add("value1");
$a->add("value2");

$arr = $a->toArray();

foreach ($arr as $a => $value) {
    echo $a . " : " . $value . "<br />";
}

Result:

0 : value1
1 : value2

To those who find this question in the future there is another way that I would consider to be a better practice than the accepted answer, which just converts the ArrayCollection to an array. If you are going to just convert to an array why bother with the ArrayCollection in the first place?

You can easily loop over an ArrayCollection without converting it to an array by using the getIterator() function.

foreach($arrayCollection->getIterator() as $i => $item) {
    //do things with $item
}