Questions in: Core PHP

Public : access anyware in script
Protected: access only same class and access inherited class
Private: access only in same class
Final: restrict overriding with child class

in object by default all variables are presistent. so some
time we want to avoid that variables means we use transient
for that variable.

maintainability,flexibility,less code

standardization , re-usability , flexibility , less code

In procedural programming the main emphasis is on procedure
while in object oriented the data is important part. on the
same hand data is more secured in object oriented program.
-----------------------------------------------------------
Procedure Oriented Language:
---------------------------
PO Language is fully concentrates on
Procedures/functions/methods. It normally works as a
sequence of actions as seen in flowchart or in any
algorithm. It follows top-down approach. It totally focuses
on methods and not the data which is utilized by methods.
In PO languages if data is used by many methods then its
declared as global data but there is a problem if we do
that, what is that, if we forgot or by mistake if we
consume that data in some other method than it comes with
problem. Mostly these scenarios happen in large systems.
Example: COBOL, PASCAL, C, FORTRAN etc.
Object Oriented Language:
------------------------
OO concepts says it think about data and bind that data and
methods those are manipulating that data into one entity
known as object and then utilize that object into system.
Example: C++, Java, C#, VB.Net etc.
There are some fundamental concepts of OO Language which a
language has to follow to be a truly OO language.
• OBJECT
• CLASS
• ABSTRACTION
• ENCAPSULATION
• DATA HIDING / INFORMATION HIDING
• INHERITANCE
• POLYMORPHISM

C employs top down approach which is an procedure oriented,
where as c++ employs bottom up approach which is an object
oriented language.

Sometimes a function is best shared among a number of
different classes. Such functions can be declared either as
member functions of one class or as global functions. In
either case they can be set to be friends of other classes,
by using a friend specifier in the class that is admitting
them. Such functions can use all attributes of the class
which names them as a friend, as if they were themselves
members of that class. A friend declaration is essentially a
prototype for a member function, but instead of requiring an
implementation with the name of that class
attached by the double colon syntax, a global function or
member function of another class provides the match.

friend function can acces private member in class

All of those are open source resource and costs nothing.
Security of Linux is very more than windows. Apache is a
better server that IIS both in functionality and security.
MySQL is world most popular open source database. PHP is
more faster that asp or any other scripting languag.

lamp for linux purpose.. and wamp for windows purpose.. and
php, mysql, apache these all are open source.

using AES_ENCRYPT() and AES_DECRYPT().

Using
AES_ENCRYPT() and AES_DECRYPT()

The Zend Engine is the internal compiler and runtime engine
used by
PHP4. Developed by Zeev Suraski and Andi Gutmans, the Zend
Engine is an
abbreviation of their names. In the early days of PHP4, it
worked as
follows:
The PHP script was loaded by the Zend Engine and compiled
into Zend
opcode. Opcodes, short for operation codes, are low level binary
instructions. Then the opcode was executed and the HTML
generated sent
to the client. The opcode was flushed from memory after
execution.Today, there are a multitude of products and
techniques to help you
speed up this process.
In the following diagram, we show the how modern
PHP scripts work; all the shaded boxes are optional.
PHP Scripts are loaded into memory and compiled into Zend
opcodes.
(oops..i couldn't copy the images. is there any other way to
post them?)

PHP -5.1.2
Mysql -5.1
Apache - 2
Wamp -1.7.3

PHP: 7.0.4 / March 3, 2016
Apache: 2.4.18 December 14, 2015
MySQL: 5.6.26 / July 24, 2015

IMAP:-( Internet Message Accese protocol) Port No is- 143
1.imap_list : Read the list of mailboxes
2. imap_open : Opens an IMAP stream to mailbox
3.after open the mail box one copy of the mail ll be a store
in server.
POP3 (Post Office Protocal) Port no-110
1.imap_list : Read the list of mailboxes
2.imap_open : Opens an IMAP stream to mailbox
3.After open the mail there ll be nothing in server.
LDAP:- (Light weight Directory Access protocol) port no-636
1. ldap_connect : This will connect to the ldap server with
the given login credentials.
2. ldap_search : By using this command we can search in ldap
records.
3.It is faster than other database like mysql,sql,oracle
4.It can write small amount of data but read becames faster.
5.Ex: outlook express

Examples of IMAP Functions:
1. imap_list : Read the list of mailboxes
2. imap_open : Opens an IMAP stream to mailbox
Examples of LDAP Functions:
1. ldap_connect : This will connect to the ldap server with
the given login credentials.
2. ldap_search : By using this command we can search in ldap
records.

Set this option in php.ini file to allow type of tags.
short_open_tag = On

In the php.ini file you can change the value of
short_open_tag = on in to short_open_tag = off

include();--> include the file, but in case of file missing
throws a warning and continues execution of code of next line.
require();--> require also includes the file but in case of
file missing throws an fatal error and stop the execution of
the code of next line.
include_once();-->if same file was included first it will
not include the file another time.

require - including a file/page ,if file doesn't exist,then
it gives error and doesn't execute.
include-including a file/page,if file doesn't exit,then it
gives warning and begin to execute.
include_once-including file/page, if it didn't been already
included,it includes else it won't.

yes we can use it.

Yes we cab include the files two time in the PHP page.

Default type is MyISAM
Generates 3 files
1.frm
2.Myd
3.Myi
format files

There are fives tables in MySQL
1 MyISAM
2 Heap
3 Merge
4 INNODB
5 ISAM
When we create a table in MySQL, MyISAM is created

4 ways
1. mysql_fetch_rows
2. mysql_fetch_object
3. mysql_fetch_assoc
4. mysql_fetch_array

1. mysqli_fetch_rows
2. mysqli_fetch_object
3. mysqli_fetch_assoc
4. mysqli_fetch_array

mysql_fetch_object : will return the results from database
as objects. fields will be accessible like in objects
i.e $result->name,$result->cust_name
mysql_fetch_array : will return the results from database as
array. fields will be accessible like in objects
i.e $result[name],$result[cust_name]

mysql_fetch_object : will return the results from database
as objects. fields will be accessible like in objects
i.e $result->name,$result->cust_name
mysql_fetch_array : will return the results from database as
an array.The array will be in in associative as well as
numeric manner.
i.e $result['column_name'] or $result[0].here '0'indicates
first column in table

get() method sends data in the form of url but post() method
will send as a data stream.
data transfered thru get() method is not secured whereas
post() method is safe and secured.
data sent thru get() method will be truncated but for post()
method there is no limitation on the amount of data being sent.

Who know who is the father of php is any one knows that
please comment on this??????
if u ask who is the developer of the php then i tell RASMOUS
LEDORF.......

Rasmus Ledorf is the father of PHP
PHP 3: Functionalities added.
PHP 4: Zend Engine added for code optimisation
PHP 5: Object oriented Programming concepts added.

Document Root is the webservers default directory from
which webserver serves the web documents according to
clients request. When we type website address in address
bar of browser. It displays the default document which we
have define with webserver configuration and it comes from
directory which we have defined as Document Root in web
server configuration.

assume if we run like this
localhost/test/test.php
then the output is
c:xampphtdoc