php出错Warning: Cannot modify header information - headers already sent by (output started at
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出这个错误是因为 header('Content-Type:text/html;charset= UTF-8');
发送头之前不能有任何输出,空格也不行,你需要将header(...)之前的空格去掉,或者其他输出的东西去掉,如果他上面include其他文件了,你还要检查其他文件里是否有输出。再就是文件的编码格式是UTF-8(无BOM)的而不能是UTF-8
UTF-8(无BOM)和UTF-8的区别
BOM: Byte Order Mark
UTF-8 BOM又叫UTF-8 签名,其实UTF-8 的BOM对UFT-8没有作用,是为了支援UTF-16,UTF-32才加上的BOM,BOM签名的意思就是告诉编辑器当前文件采用何种编码,方便编辑器识别,但是BOM虽然在编辑器中不显示,但是会产生输出,就像多了一个空行.
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