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<?php |
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/** |
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* Class Numbers |
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* |
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* @link https://www.icy2003.com/ |
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* @author icy2003 <[email protected]> |
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* @copyright Copyright (c) 2017, icy2003 |
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*/ |
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namespace icy2003\php\ihelpers; |
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use icy2003\php\I; |
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/** |
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* 数字处理 |
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*/ |
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class Numbers |
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{ |
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/** |
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* 比较两个任意精度的数字 |
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* |
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* @param string $number1 数字1 |
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* @param string $number2 数字2 |
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* @param integer $scale 精确度，默认精确到小数点后 2 位 |
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* |
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* @return boolean |
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*/ |
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public static function isEquals($number1, $number2, $scale = 2) |
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{ |
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return 0 === bccomp($number1, $number2, $scale); |
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} |
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/** |
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* 加载一些奇怪的常量 |
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* |
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* 我知道这些符号不好打，所以从注释里复制喽 |
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* |
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* @constant double π 圆周率 |
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* @constant double e 自然常数 |
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* @constant double γ 欧拉常数 |
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* @constant double φ 黄金比 |
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* @constant double c 光速 |
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* |
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* @return void |
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*/ |
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public static function load() |
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{ |
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I::def('π', M_PI); |
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I::def('e', M_E); |
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I::def('γ', M_EULER); |
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I::def('φ', (sqrt(5) - 1) / 2); |
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I::def('c', 2.99792458e8); |
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} |
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/** |
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* 获取数字在指定长度的位置 |
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* |
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* @param integer $number |
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* @param integer $length |
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* |
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* @return integer |
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*/ |
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public static function position($number, $length) |
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{ |
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while ($number < 0) { |
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$number += $length; |
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} |
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return $number % $length; |
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} |
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/** |
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* 转成字节数 |
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* |
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* @param string $size 例如：10m、10M、10Tb、10kB 等 |
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* |
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* @return integer |
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*/ |
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public static function toBytes($size) |
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{ |
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$callback = function ($matches) { |
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$sizeMap = [ |
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'' => 0, |
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'b' => 0, // 为了简化正则 |
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'k' => 1, |
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'm' => 2, |
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'g' => 3, |
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't' => 4, |
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'p' => 5, |
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]; |
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return $matches[1] * pow(1024, $sizeMap[strtolower($matches[2])]); |
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}; |
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return preg_replace_callback('/(\d*)([a-z]?)b?/i', $callback, $size, 1); |
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} |
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/** |
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* 字节数尽可能转成 k、m、g 等形式 |
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* |
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* @param integer $bytes |
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* |
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* @return string |
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*/ |
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public static function fromBytes($bytes) |
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{ |
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$unit = array('b', 'kb', 'mb', 'gb', 'tb', 'pb'); |
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return @round($bytes / pow(1024, ($i = floor(log($bytes, 1024)))), 2) . ' ' . $unit[$i]; |
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} |
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/** |
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* 比较两个值（如：10m、10M、10Tb、10kB 等）的大小 |
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* |
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* - 0：相等，-1：左小于右，1：右小于左 |
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* |
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* @param string $size1 |
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* @param string $size2 |
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* |
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* @return integer |
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*/ |
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public static function compareSize($size1, $size2) |
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{ |
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$bytes1 = self::toBytes($size1); |
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$bytes2 = self::toBytes($size2); |
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return ($v = $bytes1 - $bytes2) == 0 ? 0 : intval(($v) / abs($v)); |
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} |
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} |
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icy2003 /
php
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