php, mysq lpart1
DESCRIPTION
php mysql introduction, php variablesTRANSCRIPT
SUBHASIS NAYAK
CMC
PHP, MYSQL
What we will discuss ?
Here we will discuss what PHP is all about?
PHP MySql Apache installationPHP basics.
Variables & data typesFlow controlsFunctions
What php is all about?
PHP is hugely popular, and mostly used programming language for website’s backend process.
IT is a programming language that was designed for making dynamic websites.
he name PHP is a recursive acronym that stands for PHP: Hypertext Preprocessor.
Hi! I am not with time to describe more about PHP. So go the site http://php.net and check it out.
Continue …..
The PHP language is flexible and easy to learn quickly even if you have not done any programming in the past.
If you have done any programming language like c, c++, java then you can learn PHP in one night.
Installing AMP
It has three steps Installing Apache – it is very simple step by step. Installing php –
extract your php compressed package. Set the environment path. To ‘conf ‘ folder of apache=>open httpd.conf and enable all
belows LoadModule php5_module “///” AddType application/x-httpd-php.php AddTypeapplication/x-httpd-php-source.phps
Installing Mysql. Doing configuration
Configure PHP
To configure php go to “php.ini”Search for “register_global” check it for if not change
it to off.Search for “error_reporting and display errors”. When
we are writing your code enable it by doing “E_ALL”. After production disable it by doing “E_NONE”
Change the session data to store in a particular folder to do so. “session.save_path=c:/windows/temp”
The default execution time is 3o seconds. It is not possible for some scripts to complete execution within 30 secs .you can change to 10 to 15 minutes. Put the value like this “max_executin time = 900”
Save your “php.ini”
& restart ur apache
to get the effect.
Basic architecture
Browser Data baseMiddle Ware(PHP,JSP.
ASP)
Web server(Apache/IIS
)
Variables
All variables start with ‘$’.Variable starts with alpha numeric.Stay away from using underscore from at
start of variable.Variable can contain alpha numeric.
$name$var1$var_Name$varName
Good practice of writing variable
Good practice of writing variable
Working with numbers
You can do all
mathematical operation
like this?
Strings
String is a collection of characters treated as single entity.
In PHP we put a string using: Within two double quotes = “” Within two single quotes = ‘’
$myString = “Welcome to Open Source”;
$myString = ‘Welcome to Open Source’;
Bypassing the special characters
Some times we need to work with special characters which is used by the php.
Even some special characters are there for Mysql.
Some times we want to by pass the characters.We have to by pass the double quote in between
double quote.We have to by pass the Single quote in between
single quote.To do that we need to use (\) back slash before
the characters.
Cont’d …..
$str =“my Name is “Papu” ”;
$str =“my Name is \“Papu\” ”;
$str =‘my Name is ‘Papu’ ‘;
$str =‘my Name is \’Papu\’ ‘;
$str =‘my Name is “Papu” ‘;
$str =‘my Name is ”Papu” ‘;
No need of (\)
Stick w
ith one
style
Cont’d …..
Remember if you put a variable in between double quote it will replace by it’s value. In between single it the variable will be displayed.
String concatenation
We can join two strings using a (.) operator.
String comparison
We can compare two strings using <,>,<=,>=,==