PHP’s configuration file is called php.ini.

CONSTRUCTOR : PHP allows developers to declare constructor methods for classes. Classes which have a constructor method call this method on each newly-created object, so it is suitable for any initialization that the object may need before it is used.

DESTRUCTORS : PHP 5 introduces a destructor concept similar to that of other object-oriented languages, such as C++. The destructor method will be called as soon as all references to a particular object are removed or when the object is explicitly destroyed or in any order in shutdown sequence.

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.

move_uploaded_file( string filename, string destination)

<?php
$tomorrow = mktime(0, 0, 0, date("m") , date("d")+1, date("Y"));
$lastmonth = mktime(0, 0, 0, date("m")-1, date("d"), date("Y"));
echo ($tomorrow-$lastmonth)/86400;
?>

setcookie('variable','value','time');
variable - name of the cookie variable
value     - value of the cookie variable
time       - expiry time

Example:
<?php
setcookie('Test',$i,time()+3600);
?>
Test - cookie variable name
$i - value of the variable 'Test'
time()+3600 - denotes that the cookie will expire after an one hour

CRYPT(), MD5()

mysql_fetch_array:
Fetch a result row as an associative array and a numeric array.

mysql_fetch_object:
Returns an object with properties that correspond to the fetched row and moves the internal data pointer ahead. Returns an object with properties that correspond to the fetched row, or FALSE if there are no more rows.

mysql_fetch_row():
Fetches one row of data from the result associated with the specified result identifier. The row is returned as an array. Each result column is stored in an array offset, starting at offset 0.