PHP Common Mathematical function usage

This article mainly introduces the common mathematical function usage of PHP, briefly enumerates the common mathematical functions of PHP and gives the function and use skill of BC high-precision function with the example form, and the need of friends can refer to

This paper describes the common mathematical functions of PHP and the usage of BC high-precision mathematical functions. Share to everyone for your reference, as follows:

1. Bcadd the sum of arbitrary precision numbers
2. Subtraction of bcsub arbitrary precision number
3. Bcmul Multiplication, bcp division
4. Bcmod take the remainder. (more powerful than% function)
5. Bcpow Power function operation
6. bcsqrt Square Root
7. sqrt Square root operation
7. Pow exponentiation
8. ABS to seek absolute value
9. Pi to get PI value

Trigonometric function

Sin Cos Tan asin ACOS ATAN (expressed in radians)
Deg2rad Angle converted to radians
Convert rad2deg radians to angles

Index

Log for natural logarithm, log10 for 10-bit base logarithm
Exp to the power of the base E

Conversion of various number numbering

Base_convert General-purpose arbitrary-numbering conversion
Bindec binary conversion to decimal
Decbin decimal into binary
Dechex decimal into hexadecimal
Decoct decimal into octal
Hexdec 16 Conversion into decimal
Octdec octal into decimal

BC High Accuracy Function Usage Example:

<?php/*************************************************************************************** *php BC High accuracy function Library * php BC Math contains: Add, compare, divide, subtract, balance, multiply, n-squared, configure default decimal number, squared * These functions are useful when it comes to the calculation of money ***************************************** * Two high-precision number comparison * encountered in the work of a situation, 0.00!  = 0 *int Bccomp (string $left _operand, String $right _operand [, int $scale]) * $left = $right returns 0 * $left < $right return-1 * $left > $right returns 1 * $scale the number of decimal places ******************************************************************************* /$a = 4.45; $b = 5.54;if (Bccomp ($a, $b, 2) = = 0) {echo "Exactly equal";} /*************************************************************************************** * Two high-precision number addition *string Bcadd ( String $left _operand, String $right _operand [, int $scale]) * $scale the number of decimal points returned ****************************************** /$a = 1.0321456; $b = 0.0123456; $c = Bcadd ($a, $b, 2); Var_dump ($c);/****** *********************************** Two high-precision number subtraction *sstring bcsub (String $left _operand, String $right _operand [, int $scale]) * $scale number of decimal points returned ***************************************************************************************/$a = 1.0321456; $b = 3.0123456; $c = bcsub ($a, $b, 2); Var_dump ($c);/******************************************************* * * Two high-precision numbers for residual/modulus *string bcmod (String $left _operand, string $modulus) ************************************************* /$a = 6; $b = 4; $c = Bcmod ($a, $b); Var_dump ($c);/*************************************************************** * Two high-precision numbers divide *string bcp (String $left _operand, String $right _operand [, int $scale]) * $scale decimal point The number of digits defaults to 0 ***************************************************************************************/$a = 6; $b = 5; $c = bcp ($a, $b, 3); Var_dump ($c);/*************************************************************************************** * Two high-precision numbers multiplied *string Bcmul (String $left _oPerand, String $right _operand [, int $scale]) * $scale The default number of decimal places is 0 ****************************************************** /$a = 3.1415926; $b = 2.4569874566; $c = Bcmul ($a, $b, 6); Var_dump ($c);/*************** * Two high-precision number of the secondary value *string Bcpow (String $left _ Operand, string $right _operand [, int $scale]) * $scale The default number of decimal places is 0 ***************************************************** /$a = 3.1415926; $b = 2; $c = Bcpow ($a, $b, 3); Var_dump ($c);/************************* * The square root of the *string bcsqrt (string $operand [, int $scale]) * $scale The default number of decimal places is 0 **************** /$b = BCSQRT ($a, 6); Var_dump ($b);/****************************** * Set the number of decimal places for BC functions * BOOL Bcscale (int $scale) * $scale The default number of decimal places is 0 ******************************/bcscale (2);? >

Operation 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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