php获取指定范围内最接近数的方法

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本文实例讲述了PHP获取指定范围内最接近数的方法分享给大家供大家参考。具体实现方法如下:

PHP;"> // Returns the next higher or lower number function NextRelatedNumber($number,$range){ $r = $number % $range; $f = $number - $r; $b = round($r / $range,0); return ($b == 1) ? $f + $range : $f; } // Returns the next higher number function NextHigherNumber($number,$range){ $r = $number % $range; $f = $number - $r; $b = ceil($r / $range); return ($b == 1) ? $f + $range : $f; } // Returns the next lower number function NextLowerNumber($number,$range){ $r = $number % $range; $f = $number - $r; $b = floor($r / $range); return ($b == 1) ? $f + $range : $f; } // Returns the next related number from an array function NextNumberArray($Number,$NumberRangeArray){ $w = 0; $c = -1; $abstand = 0; $l = count($NumberRangeArray); for($pos=0; $pos < $l; $pos++){ $n = $NumberRangeArray[$pos]; $abstand = ($n < $Number) ? $Number - $n : $n - $Number; if ($c == -1){ $c = $abstand; continue; } else if ($abstand < $c){ $c = $abstand; $w = $pos; } } return $NumberRangeArray[$w]; }

// 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)

希望本文所述对大家的PHP程序设计有所帮助。

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