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php BC高精确度函数库

Jun 21, 2016 am 08:46 AM
dump right SCALE string

<!--?php  
 ***************************************************************************************
 *php BC高精确度函数库
 *php bc math 包含了:相加,比较,相除,相减,求余,相乘,n次方,配置默认小数点数目,求平方
 *这些函数在涉及到有关金钱的计算时比较有用
 ****************************************************************************************


 ***************************************************************************************
 *两个高精度数比较
 *工作中遇到一种情况,0.00 != 0
 *int bccomp ( string $left_operand , string $right_operand [, int $scale ] )
 *$left=$right 返回 0
 *$left<$right 返回 -1
 *$left-->$right 返回 1
 *$scale 小数点位数
 ***************************************************************************************
$a = 4.45;
$b = 5.54;
if(bccomp($a, $b, 2) == 0)
{
    
}

 ***************************************************************************************
 *两个高精度数相加
 *string bcadd ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale 返回的小数点个数
 ***************************************************************************************
$a = 1.0321456;
$b = 0.0123456;
$c = bcadd($a, $b, 2);
//var_dump($c);

 ***************************************************************************************
 *两个高精度数相减
 *sstring bcsub ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale 返回的小数点个数
 ***************************************************************************************
$a = 1.0321456;
$b = 3.0123456;
$c = bcsub($a, $b, 2);
var_dump($c);



 ********************************************************
 *两个高精度数求余/取模
 *string bcmod ( string $left_operand , string $modulus )
  *******************************************************
$a = 6;
$b = 4;
$c = bcmod($a, $b);

//var_dump($c);

 ***************************************************************************************
 *两个高精度数相除
 *string bcdiv ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale小数点位数默认为 0
 ***************************************************************************************
 $a = 6;
 $b = 5;
 $c = bcdiv($a, $b, 3);
 //var_dump($c);

 ***************************************************************************************
 *两个高精度数相乘
 *string bcmul ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale小数点位数默认为 0
 ***************************************************************************************
$a = 3.1415926;
$b = 2.4569874566;
$c = bcmul($a, $b, 6);
//var_dump($c);

 ***************************************************************************************
 *两个高精度数的次方值
 *string bcpow ( string $left_operand , string $right_operand [, int $scale ] )
 *$scale小数点位数默认为 0
 ***************************************************************************************
$a = 3.1415926;
$b = 2;
$c = bcpow($a, $b, 3);
//var_dump($c);

 **************************************************
 *求高精度数的平方根
 *string bcsqrt ( string $operand [, int $scale ] )
 *$scale小数点位数默认为 0
 ***************************************************
$b = bcsqrt($a, 6);
//var_dump($b);

 ******************************
 *设置bc函数的小数点位数
 *bool bcscale ( int $scale )
 *$scale小数点位数默认为 0
 ******************************
//bcscale();
?> 
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