PHPFATALERROR:CALLTOUNDEFINEDFUNCTIONBCMUL()解决办法_php实例

PHP环境：
PHP版本为5.3.3
系统为Red Hat 4.1.2-54

查看apache的错误日志，发现是加密文件中一个函数bcmul()报错：
代码如下:
PHP Fatal error: Call to undefined function bcmul() in /php_rsa.php on line xxx

解决办法：
使用如下命令:
代码如下:yum install php-bcmath
就安装好了。

如果出现下面这种情况：

代码如下:
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

就需要使用yum update 之后再yum install php53-bcmath就好了

顺便了解了一下，bcmath这个函数是PHP数学扩展中的一个。可以使用 bcscale() 来设置全局默认的小数位数，具体用法如下：
代码如下:
string bcmul ( string $left_operand , string $right_operand [, int $scale ] )

例子：
代码如下:
echo bcmul('1.34747474747', '35', 3); // 47.161
echo bcmul('2', '4'); // 8
?>

此函数在php.ini中的选项：
代码如下:
[bcmath]
; Number of decimal digits for all bcmath functions.
; http://www.php.com/manual/en/bc.configuration.php#ini.bcmath.scale
bcmath.scale = 0