PHP FATAL ERROR: CALL TO UNDEFINED FUNCTION BCMUL() solution_PHP tutorial

While migrating a server that handles online payments, it was discovered that payments could not be made.

PHP environment:
PHP version is 5.3.3
The system is Red Hat 4.1.2-54

Check the apache error log and find that it is in an encrypted file A function bcmul() reports an error:

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PHP Fatal error: Call to undefined function bcmul() in /php_rsa.php on line xxx

Solution:
Use the following command:

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yum install php-bcmath

is installed.

If the following situation occurs:

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Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base : mirrors.yun-idc.com
* extras: mirrors.yun-idc.com
* rpmforge: ftp.riken.jp
* updates: mirrors.yun-idc.com
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-bcmath.x86_64 0:5.1.6-40.el5_9 set to be updated
--> ; Processing Dependency: php-common = 5.1.6-40.el5_9 for package: php-bcmath
--> Running transaction check
---> Package php-common.x86_64 0:5.1.6 -40.el5_9 set to be updated
--> Processing Conflict: php53-common conflicts php-common
--> Finished Dependency Resolution
php53-common-5.3.3-13.el5_9. 1.x86_64 from installed has depsolving problems
--> php53-common conflicts with php-common
Error: php53-common conflicts with php-common
You could try using --skip-broken to work around the problem
You could try running: package-cleanup --problems
package-cleanup --dupes
rpm -Va --nofiles --nodigest

You just need to use yum update and then yum install php53-bcmath

By the way, I learned that the bcmath function is one of the PHP mathematics extensions. You can use bcscale() to set the global default number of decimal places. The specific usage is as follows:

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string bcmul ( string $left_operand , string $right_operand [, int $scale ] )

Example:

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echo bcmul('1.34747474747', '35', 3); // 47.161
echo bcmul('2', '4'); / / 8
?>

Options for this function in php.ini:

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[bcmath]
; Number of decimal digits for all bcmath functions.
; http://www.php.net/manual/en/bc.configuration.php#ini.bcmath.scale
bcmath.scale = 0

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