Several common questions_PHP tutorial

1. Configure php.ini and modify session.save_path
such as: session.save_path = d:/developer/php/temp or /tmp
2. Program
1.php
session_start();
$var1 = "test";
session_register("var1");
?>
2.php
session_start() ;
echo $var1;
?>
First run 1.php, then run 2.php, the page should have test
session "headers already sent" error
Error prompt: Cannot send session cookie - headers already sent by ...
This error occurs because there is an output statement before the session_start(); statement in the page
as follows:

session_start();
$var1 = "test";
session_register("var1");
?>



Put to the back to finish
File upload
Modify php.ini
upload_tmp_dir=d:/temp or /tmp
upload.php
====================================





if ($upload){
$real_path = $userfile_name;
if (file_exists($real_path)){
unlink($real_path );
}
if (!@copy($userfile,$real_path))
$upload_flag = false;
else
$upload_flag = true;
}
? >

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