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$a != abs($a)
$a+abs($a) == 0
$a && !($a + abs($a))
$n>>1 > $n
substr_count($a,"-")
is_nan(sqrt($number))
is_nan(log($n))
!array_shift(explode("-", $num))
(int)$var === ~~(int)$var
strlen(strval($num)) != strlen(strval(abs($num)))
strlen(decbin($n)) == 32
is_int(strpos(get_headers("http://habrahabr.ru/blogs/php/page$num/")[0], '404'));
function lessThanZero ($num) {
while (1) {
if ($num++ == 0) {
return true;
}
}
}
function is_value_between($value, $begin, $end) {
return in_array($value, range($begin,$end));
}