php basic part1

MyBlog = http://excellentprogramming.blogspot.com

BASICS OF PHP PART1Author –Subhasis Nayak

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http://excellentprogramming.blogspot.com/


WHY $PHP ? Hi! Friends the day has gone when we designed our

website with only html.On those days internet is used for only collect information. But now a days we are in web2.0 world of internet.

Now a days each and every one is on internet. Each one is socializing him selves.More and more companies coming to internet world to sell products or stay with their customers.

So we can not stay with html to provide a high end site like facebook.com , youtube.com, ebay.com, blogger.com,ibibo.com and etc.

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$CONTINUE .... Oh ! Yes you may ask me, why we choose

php rather choosing a language like jsp,asp or etc.

Answer is very simple .PHP is open source and easily compatable with the cheaper and secured database like MYSQL.

Next is more than 70% web site owner choosing php,mysql server due to the less price and high end performance.

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$CODE DISSECTION Well just below there is a line of php code. In

this code first and last part is most. Which tells the web server to start and end of php block or code. You must write any php code inside the php block else you will get errors.

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<?php echo “Welcome to PHP programming” ; ?>



$VARIABLES It is the symbolic representation of the value. As

the name suggest it can change over time. It can contain.In PHP it has some sort of rules for variable naming as follows. It must start with a dollar sign Followed by a letter, under score It must not contain any space else php will think it as

a different entity. It can contain letters, numbers, underscores or

dashes. It is case sensitive.

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$CONTINUE .... In php we are not using type of value it is

going to be store a like other programming lanuage. So we just use a dollar sign ”$” and variable name. When we store a value it automatically detects the type and works on it. Declaration and value assigning in php as below. $urname,$ur_name,$Urname - (declaring a

variable) $urname = “Subhasis Nayak”; $age = 25;

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$VALIDE VARIABLES.Good variables Bad variables

$itemname $item-name

$Itemname $item__name

$item_name $_itemname

$itemName

$item0

Php itself used this type

You might confused with subtraction sign

You might confused with number of dashes



$HOW TO USE VARIABLES ? Examples of the naming variables: -

$employee_name

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<?php$myvariable = 200;echo $myvariable;$myVariable =”Welcome to Nayak world”;echo $myVariable;$myvariable=500;echo $myvariable; ?>



EXPLANATION OF PROGRAM <?php?> - these two are php strat and end

tags. All codes must be inside of this to run else we will get errors.

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$myvariable = 200;$myVariable =”Welcome to Nayak world”;$myvariable=500;

Variables with values

echo $myvariable;Displays the value of the variavle



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USING VARIABLE

On left hand side i just put a value ‘100’ to variable name $myVar. Once here we asign the value w can echo(display) or use it. Here we can put another value to variable $myVar.

Here we display the value then we assign another value and display it. Go to my blog for downloading the source code for this program.

<?php

$my Var = 100;

echo ”value on variable ” .$myVar. ”</br>”;

$my Var = 500;

echo ”value on variable ” .$myVar. ”</br>”;

?>



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CASE SENSITIVITY

You must dwonload the program casesensitivity.php and run it. Tell me what you will find. Put the answer as comment just below the post. I will check reply you the answer why it is so. If you get that why so? Then comment it.

<?php

$my Var = 100;

echo ”value on variable ”.$myVar. ”</br>”;

$my Var = 500;

echo ”value on variable ” .$myvar. ”</br>”;

?>



$NUMBERS IN PHP We can do math works as we do in other

programming language. Let’s check some example.

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$mynumber =10;$mynumber +=10; ans=20$mynumber -=10; ans=10$mynumber *=10; ans=100$mynumber /=10; ans=10Increment &decrement:-$mynumber++ $mynumber- -



$FLOATING POINT NUMBERS We can work with floating point number a in other

programming languages. Be careful there is nothing special to create a floating point in PHP. Some of them are as below.

Rounding up the floating point:-

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$varfloat =3.14;echo 12/5;

Round($varfloat,1); ans=3.1 (rounded one decimal point)Ceil($varfloat); ans=4 (it rouned up tp next integer)Floor($varfloat); ans=3 (it rounds up previous integer)



$STRINGS IN PHP

In PHP we can use strings in a different ways. We can print a whole string with the help of echo

and double quote (“”) as below Example: - echo “Welcome to PHP world”;

We can print a whole string with the help of echo and single quote (‘’) as below Example:- echo ‘welcome to the drupal’;

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CONTINEUE ....

We can assign the a string to a variable as like below. Example: - $my_string =”Hi, Do you know, Joomla is

very powerful”; can do concatenations like below.

Example: - echo $my_variable. “wow!”; We can print a string with a variable combinedly

as below. Example: - echo $my_string. ” a CMS”;

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$STRING FUNCTIONS There are a lot of predefined string functions

in PHP. We can collect the information about them from http://php.net . some of them as below Concatenation –

Example:- $my_string1=”HI! Good morning”;

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$my_string1=”HI! Good morning”;$my_string2=” and have a nice day”;$my_string3=$my_string1;$my_string3 .=$mys_tring2 ;echo $my_string3;


http://php.net/


CONTINUE .... Lowercase and uppercase-

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$mystring = “I AM A PROGRAMMING ROBOT”;$my_lower = strtolower($mystring);echo $my_lower;$mystring =“programming is my hobby”;$my_upper = strtoupper ($mystring);echo $my_upper;



CONTINUE .... Uppercase of first character of the sentence.

Upper casing the first character of each word .

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$my_string1 = “hello! Mr. Guest”;$my_str = ucfirst($my_string1);echo $my_str;

$my_string2 = “hello! Mr. Someone”;$my_lower = ucwords($my_string2);echo $my_str;



$ MEET YOU ON NEXT SESSION On next session We will disscuss on

Arrays and arrays functions Type casting Constants Control structures

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Thank youTil l then bye bye.


php basic part1

Education