在Linux（CentOS）上安装imagick扩展时，遇到如下错误：
checking ImageMagick MagickWand API configuration program... checking Testing /usr/local/bin/MagickWand-config... Doesn't exist checking Testing /usr/bin/MagickWand-config... Doesn't exist checking Testing /usr/sbin/bin/MagickWand-config... Doesn't exist checking Testing /opt/bin/MagickWand-config... Doesn't exist checking Testing /opt/local/bin/MagickWand-config... Doesn't exist configure: error: not found. Please provide a path to MagickWand-config or Wand-config program.
安装如下软件即可：
yum install ImageMagick-devel