PHP Questions

The PHP default variable $_PHP_SELF is utilized for the PHP script name and when you click "submit" catch then same PHP script will be called.

To pass the information into the script from outside, help can be taken from the PHP CLI (Command line interface) method. Suppose addition of two numbers has to be passed to PHP then it can be passed like this on the command line:

php add.php 2 3

Here the script name is add.php, and 2 and 3 are the numbers that has to be added by the script. These numbers are available inside the script in an array called $argv. This array contains all the information on the command line; the statement is stored as follows:

$argv[0]=add.php

$argv[1]=2

$argv[2]=3

So, $argv always contains at least one element — the script name.

Then, in your script, you can use the following statements:

$sum = $argv[1] + $argv[2];

echo $sum;

$argc is a variable that stores the numbers of elements in $argv. $argc is equal to at least 1, which is saved for the name of the script. Example is $argc=3 using the above statements.

The mail() function allows you to send emails directly from a script.

By using $_SERVER['REMOTE_ADDR'], $_['HTTP_REFERER'] etc.

$message is a variable with a fixed name. $$message is a variable whose name is stored in $message. 

If $message contains "var", $$message is the same as $var.

    Yes we can use include("xyz.php") more than one time in any page. but it create a prob when xyz.php file contain some funtions declaration then error will come for already declared function in this file else not a prob like if you want to show same content two time in page then must incude it two time not a prob

Array                                              Descriptions
--------------------------------           -----------------------------------
$_FILES['userfile']['name']              The original name of the file on the client machine.

$_FILES['userfile']['type']                The MIME type of the file if the browser provided 

                                                   this information. An example would be "image/gif".

$_FILES['userfile']['size']                The size, in bytes, of the uploaded file.

$_FILES['userfile']['tmp_name']      The temporary filename of the file in which the

                                                  uploaded file was stored on the server.

$_FILES['userfile']['error']              The error code  associated with this file upload.