<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<?php
session_start();
?>php5.2.9
if you make a mistake, what should I do
Warning: session_start () [function.session-start]: Cannot send session cache limiter-headers already sent (output started at D:php2222admin.php:2) in D:php2222admin.php on line 3
first session_start cannot have any output.
if you don't want to change the code, a quick solution is to change php.ini, to change the output_buffering = Off off to a specific value.
check the project file. In addition to the no bom mentioned above, you also need to see whether there is a newline space after the end tag of the php file included before session_start . There can be no characters after the end tag, otherwise it will be output as html. A good way to deal with it is that the file does not have a closing tag.
session_start on the first line
1. Never use notepad to save utf-8 format;
2. Save in ultredit as "utf-8 without bom" format.
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