array_filter problem with 0's

[Chris <chris@xxxxxxxxxxxxxxx>]

I have a string 
$num = "012 4290-2008";
I made it an array with

I tried to get the integers from the string like this.

$value =  str_split($num);
$value_new = array_filter($value, "return_int");

function return_int($value){
	if(ctype_digit($value)){
		echo $value;
		return $value;
	}
}

The echo prints out all the digits including the 0.
But the $value_new are missing the 0's.
I would appreciate it if some one can point me in the right direction

Thanks in advance

Chris


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