1. 建立文件 ext_conf_template.txt
内容：
# cat=basic; type=boolean; label=Use TTF: When set the captcha will get generated using TTF font rendering functions which will result in much more readable captchas
useTTF = 0# cat=basic; type=integer; label=Image width: The width of the captcha image
imgWidth = 95# cat=basic; type=string; label=Obfuscation color: The color of the obfuscating ellipses obfusccolor = #c0c0c0
取值：$newarray = unserialize($TYPO3_CONF_VARS['EXT']['extConf']['插件的key']);
引用至:http://omail.blog.163.com/blog/static/37438054201022563423601/