php BC high-precision function library_PHP tutorial
php BC high-precision function library
<!--?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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