Questions in: Core PHP

<?php
//To get current file name.
$file = $_SERVER["SCRIPT_NAME"];
echo $file;
?>

$file_path=$_SERVER["SCRIPT_NAME"];
$break=explode('/',$file_path);
$file_name=$break[count($break)-1];

include()-many time refresh
include_once-only one time refresh

The include_once() function includes and evaluates the
specified file during the execution of the php script. It's
behavior is similar to the include() function but the only
difference is that if the code from a file has already been
included, it will not be included again.

Database abstraction means using a common db function for
querying. This would be great when you are switching from
one database to another. You won't have to change each and
every database function. Instead of that you can simply
change the database function names in one file. This should
be considerable, if in future you are planning to change the
database. The disadvantage of this is, it will slower down
the performance.

copying a file means making a duplicate copy of the file,
moving a file means to drag a file from one place to another. it will have the same effect like cut and paste.

Basic difference between this both is follow:
Reply-to: It is user id at which you are send the this mail.
Return-path: It is user id at which mail are return when
mail is not reached to particular user id (reply_to id).

Here's a quick explanation for all of you as who wonder why
your mail goes out as "mailbot@buzzcast.com:
Customers of buzzcast can change their list properties so
that replies are either ignored (never-never land), or your
own address.
Either way, when the mail comes in, it says
To: Your Listname
From: Reply-to Name: (mailbot@buzzcast.com)
When you opr subscriber hit "reply" on the message you've
received, it will be the buzzcast customers email
(joepayingbuzzcastcustomer@hisdomain.com) if they have
chosen NOT to ignore replies.
The return path is set to us (mailbot.. ) ALWAYS, so we can
remove bad addresses from the accounts! Spiffy, eh?
Some customers may not anticipate this, or understand the
difference between from, reply-to and return-path
addresses.
Mail formats are not too difficult, but they are designed
with products like buzzcast in mind.
Remember that users will NEVER see html, code, or personal
information about your account when you mail them. Just a
cool looking campaign.
This has been a common question for me, so I thought I
would share it!

$headers = "Content-type disposition :attachmet
filename = 'filename.txt' "

To attach a file we must add the following header
as "nMIME-Version: 1.0n Content-Type: multipart/mixed"

<p>Get shows information travling on the address bar but post do not shows in this way the post method is more secure than get</p>

As said above, i also want to include another point, through get() method we can send onnly 100 characters, so get() method as limitation on the information send. whereas post() method doesn't have any limitaions.

by using object and embed method
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-
444553540000"......
and
<embed src="test.wmv .......

In u'r form tag keep an attribute called enc-type with
multipart/form-data
eg:
<form name="upload" id="upload" action="upload.php"
method="post" enctype="multipart/form-data">
So this makes the browser to think that the form is posting
a file as data and this file is sent as chunks, the file
details will be stored in a variable called $_FILES.
In u'r php file just use move_uplode_file("$temp name,<new
file path>")..
Also check the max file size in php.ini while uploading

If you're connecting to a MySQL database in your PHP
application, you'll find that there are two alternative
connctions - mysql_connect which establishes a new
connection "each time" and mysql_pconnect which uses
persistant connections. Which should you use?
Mysql_connect opens a new connection each time a PHP page is
called up, and closes the connection down again at the end
of the request. It's ideal for pages that don't have a heavy
usage - doesn't need tuning, is straightforward internally.
If you compare MySQL to a shop, this is the connection that
you would use for a small shop where the door is opened each
time a new customer wishes to enter.
Mysql_pconnect will also open a new connection when a PHP
page is called up (at any rate, it will the first time after
a server reboot), but it will NOT close the connection at
the end of the request - instead, it will save it in a
connection pool so that a subsequent request can continue to
use the same connection. It's intended for pages that do
have a heavy usage - where the resources burn up by opening
and closing connections every time might have a severe
effect on performance. If your local supermarket had a door
that was opened each time someone went in and out, there
would be a lot of needless opening and closing going on -
better to leave it open and let a whole lot of people in and
out at the same time.
But mysql_pconnect does require some tuning of the servers
and you may need to limit the numbers of connections /
children and configure timeouts and how to deal with idle
children. The PHP website includes an overview of this to
get you started.
Finally, it is worth stressing what a persistant connect
does NOT give you. It does NOT give you sessions. It does
NOT give you a per-site-visitor login. It does NOT give you
any extra functioanllity. What it does give you - in the
right circumstances - is an efficiency improvement.

mysql_pconnect() will maintain a persistent connection to
the database. whenever your script calls the connect to
database function, it first searches already existing
connections to the database and if exists it will use the
same connection to connect to the database, if not it will
open a new connection to the database. ie. Connection is
Persistent
where as mysql_connect() function will establish a new
connection whenever a connection to database needed, and
after executing the script, this function disconnects the
connection. ie. connection is not a persistent one.
mysql_pconnect() function is used where your site has a
Heavy Traffic and where as mysql_connect() function is used
when there is moderate/less traffic to your site.

PHP supports Foreign Keys in InnoDB Storage Engine in
version and above 4.0. It checks the foreign key referential
integrities on Delete and Select statements. If you strictly
needed the foreign keys and speed is not a concern then you
can create table structures using InnoDB Storage Engine.
Where as MyISAM Storage Engines does not allow foreign key
concept. But it will parse the table that contains foreign
keys but wont check the referential integreties. So it is
the job of the designer/programmer to check the desired key
and its dependency in multiple tables.
Let us suppose you have a field F1(primary)in Table1 and
this field is referenced in another tables denoted as (F2,
F3) in tables Table2, Table3......(as a foreign key)
and when you want to perform a DELETE operation/query based
on field F1, then
First you need to write a query to Delete the specified row
in Table1
and you also need to write a query to Delete all
dependent/referenced rows in other tables Table2, Table3...

PHP is a cross platform, html embedded, server side, web
scripting language.
i.e. you can run it on different platform like windows,
unix, mac etc... and you can write php code in to the file
which embedded with html code and PHP is executed on server
side specially web server like apache, microsoft IIS, or
NetScap, etc...

Answer :
you can execute thefrom anywhere like a command prompt.
in unix like OS you use the following:
/path/to/php -f /path/to/script.php
For windows OS's use the following
c:pathtophp.exe -f c:pathtoscript.php
and U can get the information by running the
C:pathtophp.exe -f

if u print any message on the browser using echo statement
or any html tags before using the "session_start()" like
statements in the scripts.
if u want to overcome that problem
simply write "ob_start();" at the very starting of script
and "ob_end_flush();" at the end.

You can use the folowing function as shown in alt.php by
ryanflynnn at my-deja.com:
<?php
$totalsize=0;
function show_dir($dir, $pos=2){
global $totalsize;
if($pos == 2)
echo "<hr><pre>";
$handle = @opendir($dir);
while ($file = @readdir ($handle)){
if (eregi("^.{1,2}$",$file))
continue;
if(is_dir($dir.$file)){
echo "|- ".$pos."s <b>$file</b>n";
show_dir("$dir.$file/", $pos+3);
}else{
$size=filesize($dir.$file);
echo "|- ".$pos."s $file ";
echo("$size <br>");
$totalsize=$totalsize+$size;
}
}
@closedir($handle);
if($pos == 2) echo "</pre><hr>";
return($totalsize);
}
$totalsize = show_dir("c:/winnt/system32/");
echo($totalsize);
?>

Sorry for previous wrong answer.
In php u can get through $_SERVER page referer.

for($i = 2000; $i < 2011; $i++) {
echo "<br>".$i, ': ', (date('L', strtotime("$i-01-
01")) ? 'Yes' : 'No'), '<br/>';
}

using the follwing function u can set the script timeout
set_time_limit(900);
timeout too 900 seconds or 15 minutes.