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【PHP】返回离当前数字最近的数

作者:liner / 发布于2014/9/22/ 546


	// 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)

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