在PHP中，between和not between是用于比较一个值是否在指定范围内的条件语句。
例如：
$value = 5;
if ($value between 1 and 10) {
echo "Value is between 1 and 10";
} else {
echo "Value is not between 1 and 10";
}
例如：
$value = 15;
if ($value not between 1 and 10) {
echo "Value is not between 1 and 10";
} else {
echo "Value is between 1 and 10";
}
总结：between用于判断一个值是否在指定范围内，而not between用于判断一个值是否不在指定范围内。
