开始好好的出现验证码，后来多试几次就出现乱码了，不知道什么问题，用老师的代码也同样不出图片，只是没有乱码了
A session had already been started - ignoring session_start() 然后出一堆乱码，请问怎么解决!
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A session had already been started - ignoring session_start() 然后出一堆乱码，请问怎么解决!
2015-05-08
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