Removing non-integer entries from an array

Question

I have a PHP array like this one:

array( [0] => 1
       [1] => 2
       [2] => 3
       [3] => Some strings
)

How can I remove an entry that is not an integer number from an array? I need to output this:

array( [0] => 1
       [1] => 2
       [2] => 3
)

Can someone give me a clue?

Answer 1

Use array_filter with is_int

$filtered = array_filter($array, 'is_int');

Edit:

As noted in the comments, it may be a better solution to use one of the following instead.

$filtered = array_filter($array, 'is_numeric');
$filtered = array_filter($array, 'ctype_digit');