This article mainly introduces the usage of common mathematical functions in PHP. It briefly lists the common mathematical operation functions in PHP and gives the functions and usage skills of bc high-precision functions in the form of examples. Friends in need can refer to it
The examples in this article describe the usage of common PHP mathematical functions and BC high-precision mathematical functions. Share it with everyone for your reference, the details are as follows:
1. bcadd Addition of arbitrary precision numbers
2. bcsub Subtraction of arbitrary precision numbers
3. bcmul multiplication, bcp division
4 . bcmod takes the remainder. (More powerful than %)
5. bcpow power function operation
6. bcsqrt square root
7. sqrt square root operation
7. pow exponentiation
8. abs find absolute value
9. pi gets the value of pi
Trigonometric function
sin cos tan asin acos atan (expressed in radians)
deg2rad Convert angles to radians
rad2deg Convert radians into angles
Exponent
log is used to find the natural logarithm, log10 is used to find the logarithm to the base 10
exp is the power with e as the base
Various number system conversion
base_convert Universal arbitrary number system conversion
bindec Binary to decimal conversion
decbin Decimal to binary conversion
dechex Decimal to Hexadecimal
decoct Convert decimal to octal
hexdec Convert hexadecimal to decimal
octdec Convert octal to decimal
BC high-precision function usage example:
<?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) { echo "完全相等"; } /*************************************************************************************** *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 bcp ( string $left_operand , string $right_operand [, int $scale ] ) *$scale小数点位数默认为 0 ***************************************************************************************/ $a = 6; $b = 5; $c = bcp($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(2); ?>
Run result:
string(4) "1.04" string(5) "-1.98" string(1) "2" string(5) "1.200" string(8) "7.718853" string(5) "9.869" string(8) "1.772453"
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Sharing examples of common PHP mathematical functions and BC high-precision mathematical functions
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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