PHP TALKS

Magic methods are the members functions that is available to all the instance of class Magic methods always starts with "__".

Eg. __construct. All magic methods needs to be declared as public To use magic method they should be defined within the class or program scope Various Magic Methods used in PHP 5 are:
__construct() __destruct() __set() __get() __call() __toString() __sleep() __wakeup() __isset() __unset() __autoload() __clone()

The header() function sends a raw HTTP header to a client.We can use header()
function for redirection of pages. It is important to notice that header() must
be called before any actual output is seen..

Following tables (Storage Engine) we can create
1. MyISAM(The default storage engine IN MYSQL Each MyISAM table is stored on disk in three files. The files have names that begin with the table name and have an extension to indicate the file type. An .frm file stores the table format. The data file has an .MYD (MYData) extension. The index file has an .MYI (MYIndex) extension. )
2. InnoDB(InnoDB is a transaction-safe (ACID compliant) storage engine for MySQL that has commit, rollback, and crash-recovery capabilities to protect user data.)
3. Merge
4. Heap (MEMORY)(The MEMORY storage engine creates tables with contents that are stored in memory. Formerly, these were known as HEAP tables. MEMORY is the preferred term, although HEAP remains supported for backward compatibility. )
5. BDB (BerkeleyDB)(Sleepycat Software has provided MySQL with the Berkeley DB transactional storage engine. This storage engine typically is called BDB for short. BDB tables may have a greater chance of surviving crashes and are also capable of COMMIT and ROLLBACK operations on transactions)
6. EXAMPLE
7. FEDERATED (It is a storage engine that accesses data in tables of remote databases rather than in local tables. )
8. ARCHIVE (The ARCHIVE storage engine is used for storing large amounts of data without indexes in a very small footprint. )
9. CSV (The CSV storage engine stores data in text files using comma-separated values format.)
10. BLACKHOLE (The BLACKHOLE storage engine acts as a "black hole" that accepts data but throws it away and does not store it. Retrievals always return an empty result)

$name is variable where as $$name is reference variable
like $name=sonia and $$name=singh so $sonia value is singh.

We can do it by 4 Ways
1. mysql_fetch_row
2. mysql_fetch_array
3. mysql_fetch_object
4. mysql_fetch_assoc

There are some defference between GET and POST method
1. GET Method have some limit like only 2Kb data able to send for request. But in POST method unlimited data can we send
2. when we use GET method requested data show in url but Not in POST method so POST method is good for send sensitive request.

preg_match("/^http:\/\/.+@(.+)$/","http://info@pcds.co.in",$matches);
echo $matches[1];

Inserts HTML line breaks (<BR />) before all newlines in a string.

.htaccess is often the only file we have access to. It lives at the root of a Web site - in the same directory as the default home page of a site - and/or below that in the subdirectories for the site. Therefore, the Webmaster can upload, modify, copy, or move it at will.

However, if you administrate your own server, then you'll also have access to httpd.conf, which is one of the server configuration files. It is located along with the rest of the server files at a level that users can't get to.

Directives in httpd.conf are compiled at server start-up, so that processing is more efficient. Directives in .htaccess, however, must be interpreted for each and every HTTP request; Interpreting them slows things down a bit, and might be done 20 times to load a single HTML page with several images and scripts on it.

However, interpreting .htaccess directives is no less efficient than interpreting any other scripted language, so you do the same thing you'd do with any script that was to be run often: Decide exactly what you need to do and code it as efficiently as possible.

On the other hand, changing a directive in .htaccess does not require the server to be restarted, so some may wish to test their code by running it in .htaccess, and then 'port' it to httpd.conf once it is initially debugged. That option -- when available -- gives the best of both worlds.

Rasmus Lerdorf is known as the father of PHP.

 Three are three types of errors:
1. Notices: These are trivial, non-critical errors that PHP encounters while executing a script  for example, accessing a variable that has not yet been defined. By default, such errors are not displayed to the user at all  although, as you will see, you can change this default behavior.
2. Warnings: These are more serious errors  for example, attempting to include() a file which does not exist. By default, these errors are displayed to the user, but they do not result in script termination.
3. Fatal errors: These are critical errors  for example, instantiating an object of a non-existent class, or calling a
non-existent function. These errors cause the immediate termination of the script, and PHP's default behavior is to display them to the user when they take place.