php获取指定范围内最接近数的方法

// Examples
// --------
// 0 10 20 30 40 50 ...
print 'NextRelatedNumber: ';
print NextRelatedNumber(44,10) . "n";
// returns --> 40
// 0 20 40 60 80 100 ...
print 'NextHigherNumber: ';
print NextHigherNumber(41,20) . "n";
// returns --> 60
// 0 5 10 15 20 25 30 35 ...
print 'NextLowerNumber: ';
print NextLowerNumber(57,5) . "n";
// returns --> 55
// Example with Array
print 'NextNumberArray: ';
print NextNumberArray(45,array(3,8,19,34,56,89)) . "n";
// returns --> 34
// (45 is between 34 and 56 but 34 is the next)