Uncaught Error: Call to undefined function Hyperf\Di\ScanHandler\pcntl_fork() in

回答: 根据引用\[1\]的信息，报错"Uncaught Error: Call to undefined function pcntl_fork()"是因为没有安装pcntl扩展包。解决这个问题有两种方式。一种是在编译php时加上--enable-pcntl选项，另一种是进入php源码的安装目录，运行phpize命令。根据引用\[2\]，编译完成后会生成pcntl.so文件，可以将该文件复制到php的扩展目录中。根据引用\[3\]，php默认的扩展程序目录是/usr/lib/php5/20060613+lfs，所以不需要在php.ini文件中额外定义扩展目录。所以，解决这个问题的方法是安装pcntl扩展包并将生成的pcntl.so文件复制到php的扩展目录中。
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