session_start():Warning Cannot send session cookie - headers already sent... 解决方法
2013-06-21 16:12
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在php端开启一个session时,有时候会出现很诡异的warning,Warning Cannot send session cookie - headers already sent。这个问题是因为在php session_start()之前已经有输出了。这样会导致session_start()调用失败。
UTF-8 + BOM编码
有一种原因是文件是UTF-8 + BOM编码,这种编码方式会在普通的utf-8文件之前加三个字符。在windows下用editplus保存是会出现这个问题。我们可以用以下php代码去查看是否有BOM头,并挪掉相应的BOM头信息。
其他问题
我们在session_start()这个php文件中include的其他php文件第一行为空白,也会引起这个问题。
UTF-8 + BOM编码
有一种原因是文件是UTF-8 + BOM编码,这种编码方式会在普通的utf-8文件之前加三个字符。在windows下用editplus保存是会出现这个问题。我们可以用以下php代码去查看是否有BOM头,并挪掉相应的BOM头信息。
function checkBOM($filename) { global $auto; $contents = file_get_contents ( $filename ); $charset [1] = substr ( $contents, 0, 1 ); $charset [2] = substr ( $contents, 1, 1 ); $charset [3] = substr ( $contents, 2, 1 ); if (ord ( $charset [1] ) == 239 && ord ( $charset [2] ) == 187 && ord ( $charset [3] ) == 191) { if ($auto == 1) { $rest = substr ( $contents, 3 ); rewrite ( $filename, $rest ); echo "BOM found, automatically removed."; } else { echo "BOM found."; } } else echo "BOM Not Found."; }
其他问题
我们在session_start()这个php文件中include的其他php文件第一行为空白,也会引起这个问题。
//空白 <?php session_start(); //第一行空白,会导致错误
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