php程序中使用session错误调试问题

开发需要接触php,感觉上手也挺快,在调试php中的session时总是出错,

warning: session_start(): cannot send session cache limiter – headers already sent (output started at xxx:2) in .php on line 3

类似错,对照源码好像自己没有哪里写错.

php开始符号

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