Calltoundefinedfunctionbcompiler_write_header()异常如何解决

Call to undefined function bcompiler_write_header() 错误怎么解决?
php程序运行时出现：Fatal error: Call to undefined function bcompiler_write_header() 错误，怎么解决。谢谢。代码如下：

$fh = fopen($this->targetPaths[$key].'encrypt.php', "w");

                    bcompiler_write_header($fh);

                    bcompiler_write_file($fh, $this->targetPaths[$key]);

                    bcompiler_write_footer($fh);

                    fclose($fh);

php function

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------解决方案--------------------
安装 bcompiler 扩展 ：http://pecl.php.com/package/bcompiler
------解决方案--------------------
需要安装 http://www.php.com/manual/en/book.bcompiler.php

安装方式：http://www.php.com/manual/en/bcompiler.installation.php