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<?php
	$arr = [1, 2, 3, -1, -2, -3];
	
	function isPositive($num) 
	{
		if ($num >= 0) {
			return true;
		} else {
			return false;
		}
	}
	
	$newArr = [];
	foreach ($arr as $elem) {
		if (isPositive($elem)) {
			$newArr[] = $elem;
		}
	}
	
	var_dump($newArr);
?>