Ob_start ();
Setcookie ("username", "Song Yan Bin", Time () +3600);
echo "The username is:". $HTTP _cookie_vars["username"]. " \ n ";
echo "The username is:". $_cookie["username"]. " \ n ";
Print_r ($_cookie);
?>
Warning:cannot Modify header Information-headers already sent by error reason
I added the header to the PHP program,
Header ("Cache-control:no-cache,must-revalidate");
After the page appears above the error, read n data also has no results. Today occasionally found that the original is my php.ini inside the configuration out of the problem, found in C:\windows\ php.ini file
The output_buffering default is off. I'm going to set it to 4096 now OK.
Used to resolve display prompt error, cannot press (date + export file number) to file name error message.
The Setcookie function must be sent out before any information is delivered to the browser.
Based on these limitations, the Setcookie () function is often met with "Undefined index", "Cannot modify header Information-headers already sent by" ... And so on, solving the "cannot modify header Information-headers already sent by" This is the wrong way to produce a cookie before the cache input to the browser, so you can add ob_ in front of the program Start (); this function.
The Ob_start () function is used to open the buffer, such as the header () function, if there is output, including carriage return \ space \ newline \ will have "Header had all ready to send by" error, you can first use Ob_start () The data Block and Echo () output that open the buffer PHP code will go into the buffer without immediately outputting it. Of course, opening the buffer is a lot of work, just play your imagination. You can summarize the following four points:
1. Before header ()
Ob_start (); Open buffer
echo \ "Hellon\"; Output
Header ("location:index.php"); redirect the browser to index.php
Ob_end_flush ();//output all content to the browser
?>
The 2.phpinfo () function obtains information on both the client and server side, but the way to save the client information with buffers is the best choice.
Ob_start (); Open buffer
Phpinfo (); Using the Phpinfo function
$info =ob_get_contents (); Get the contents of the buffer area and assign it to $info
$file =fopen (\ ' info.txt\ ', \ ' w\ '); Open File Info.txt
Fwrite ($file, $info); Write information to Info.txt
Fclose ($file); Close File Info.txt
?>
3. Static page Technology
Ob_start ();//Open buffer
?>
Full output of PHP page
$content = Ob_get_contents ();//Get all the contents of the PHP page output
$fp = fopen ("output00001.html", "w"); Create a file, and open it, ready to write
Fwrite ($fp, $content); Write the contents of the PHP page to output00001.html, then ...
Fclose ($FP);
?>
4. Output Code
Function Run_code ($code) {
If ($code) {
Ob_start ();
eval ($code);
$contents = Ob_get_contents ();
Ob_end_clean ();
}else {
echo "Error! No output ";
Exit ();
}
return $contents;
}
http://www.bkjia.com/PHPjc/319672.html www.bkjia.com true http://www.bkjia.com/PHPjc/319672.html techarticle ? PHP ob_start (); Setcookie ("username", "Song Yan", Time () +3600); echo "The username is:". $HTTP _cookie_vars["username"]. " \ n "; echo "The username is:". $_cookie["username"]. " \ n "; Print_ ...
