Intro To Php
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Intro to PHP A brief overview – Sushil Kumar
What is PHP?
PHP ("PHP: Hypertext Preprocessor") is a widely-used Open Source generalpurpose scripting language that is especially suited for Web development and can be embedded into HTML.
How it works PHP is installed on web server Our web server is Apache Server parses files based on extensions Returns plain HTML, no code
How To – The Basics Need to name files is a .php extension Example: index.php, mypage.php
Open and close tags: Was:
Save file to server, view in a browser
Hello World helloworld.php
Variables Variables are like a cup The same cup can hold lots of different things Same with variables
Variables In PHP, you create a variable with a dollar sign and some text. Usually the text will be something descriptive of what it is going to hold. $name = “susheel”; $dept = “mca”; $local_addr = “kanpur”;
Variables $name = “Josiah”; $dob = “1/1/23”; $age = 84;
Conditional statement
Like any other language php also use if else, for, while, switch case etc
If statements
$b) { echo "a is bigger than b"; } else { echo "a is NOT bigger than b"; } ?>
while loop
Include() Include function is used to include a file . It can include any type of file.
The syntax is
include “file name”;
Include()
Save it with hi.php
Include()
Functions Getting PHP to do some action for you
Functions
Advance functions of php Date/time function
Date/time function D
l w d F
A textual representation of a day, three letters (mon to sun) The day of the week Numeric representation of the day of the week Day of the month(01 to 31) Name of the month (january to december )
Date/time function
Try these
A,a,g,G,h,H,I,s,y ,Y Example:
E-mail
One of the major uses of a server side scripting language is to provide a way of sending e-mail from the server and, in particular, to take form input and output it to an e-mail address. In this part I will show you how to send e-mail messages using PHP.
E-mail To send e-mail by php we use fuction mail() The syntax is:-
mail($to,$subject,$body,$headers);
E-mail
$to = “[email protected]"; $subject = "PHP Is Great"; $body = "PHP is one of the best scripting languages around"; $headers = "From: [email protected]"; mail($to,$subject,$body,$headers); echo "Mail sent to $to";
Functions We’ll talk more about function later.
Passing information
submit
Passing information method 2
By session variable
session
Session:- Session support in PHP consists of a way to preserve certain data across subsequent accesses. This enables you to build more customized applications and increase the appeal of your web site.
session
Start a session
session_start();
Session
Store info in session
$_session[‘id’]=$id;
session
Retrieving information from session
echo $_session[‘id’];
session
Retrieving information from session
$id=$_session[‘id’]; echo $id;
session
To register a session
session_register("id");
session Session_is_registered(id) Return true if register otherwise return false
session
Destroy a session
session_destroy();
Implementation of session To implementation you must start session at each page where session is being used To session start session_start() is used .It must be type above the tag or the top of the page
Implementation of session
If session has started successful you can store information in the session
Implementation of session An example to use session
Implementation of session
Implementation of session
Implementation of session
Destroy a session
Redirect to a page Header function is used to redirect header("location:index.php");
Redirect to a page
Problem with session
Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at D:\mysite\page 1 s.php:3) in D:\mysite\page 1 s.php on line 7
references
www.phpeasystep.com
A Basic Form (Design view)
A Basic Form (code view) How we do things with PHP: basicform.html
A Basic Form Weave HTML and PHP output.php
A Basic Form Capturing the data in output.php Variables: $_POST[‘name’] $_POST[‘age’]
Data Validation
We’ll talk more about validating user input later.
A Basic Form Outputting to the screen is nice, but boring We could email the results Let’s store data in a database
Layers of a Database Server Database Tables Fields/Columns Records Data
How to Get a Database
Request a MySQL Database
Request a MySQL Database You will need: Server name Database name Username Password
Connecting to DB from PHP Create one connection script: dbconn.php
?>
Connecting to DB from PHP Create one connection script: dbconn.php
?>
Connecting to DB from PHP Remember, “Be Lazy!” At the top of each file that needs the DB:
Database Table Table named ‘info’ has two fields, name and age Use a SQL INSERT statement: $sql = “INSERT INTO info (name,age) values (‘$name’, ‘$age’)”;
Database Table Send it to the Database: mysql_query($sql);
The Whole Picture dbinsert.php
require(“dbconn.php”); $name = $_POST[‘name’]; $age = $_POST[‘age’]; $sql = “INSERT into info (name,age) values(‘$name’, ‘$age’);” mysql_query($sql); ?> Thank you, your name and age were received.
The Whole Picture - Fancier fancydbinsert.php
HTML REVISITED Create a table by html use of simple formating Inclusion css
Create an Output Page Connect to the Server Do a query of the data Programmatically write the data to a page View the page in a browser Let’s see how to do it
Connect to the Server First, include our connection script:
Do a Query of the Data This time we use SELECT $sql = “SELECT name, age FROM info”; Or if you have many fields and want to be LAZY! $sql = “SELECT * from info”;
Programmatically Write the Data Here’s the only hard part:
Putting it All Together statuspage.php
What is PHP?
PHP ("PHP: Hypertext Preprocessor") is a widely-used Open Source generalpurpose scripting language that is especially suited for Web development and can be embedded into HTML.
How it works PHP is installed on web server Our web server is Apache Server parses files based on extensions Returns plain HTML, no code
How To – The Basics Need to name files is a .php extension Example: index.php, mypage.php
Open and close tags: Was:
Save file to server, view in a browser
Hello World helloworld.php
Variables Variables are like a cup The same cup can hold lots of different things Same with variables
Variables In PHP, you create a variable with a dollar sign and some text. Usually the text will be something descriptive of what it is going to hold. $name = “susheel”; $dept = “mca”; $local_addr = “kanpur”;
Variables $name = “Josiah”; $dob = “1/1/23”; $age = 84;
Conditional statement
Like any other language php also use if else, for, while, switch case etc
If statements
$b) { echo "a is bigger than b"; } else { echo "a is NOT bigger than b"; } ?>
while loop
Include() Include function is used to include a file . It can include any type of file.
The syntax is
include “file name”;
Include()
Save it with hi.php
Include()
Functions Getting PHP to do some action for you
Functions
Advance functions of php Date/time function
Date/time function D
l w d F
A textual representation of a day, three letters (mon to sun) The day of the week Numeric representation of the day of the week Day of the month(01 to 31) Name of the month (january to december )
Date/time function
Try these
A,a,g,G,h,H,I,s,y ,Y Example:
E-mail
One of the major uses of a server side scripting language is to provide a way of sending e-mail from the server and, in particular, to take form input and output it to an e-mail address. In this part I will show you how to send e-mail messages using PHP.
E-mail To send e-mail by php we use fuction mail() The syntax is:-
mail($to,$subject,$body,$headers);
E-mail
$to = “[email protected]"; $subject = "PHP Is Great"; $body = "PHP is one of the best scripting languages around"; $headers = "From: [email protected]"; mail($to,$subject,$body,$headers); echo "Mail sent to $to";
Functions We’ll talk more about function later.
Passing information
submit
Passing information method 2
By session variable
session
Session:- Session support in PHP consists of a way to preserve certain data across subsequent accesses. This enables you to build more customized applications and increase the appeal of your web site.
session
Start a session
session_start();
Session
Store info in session
$_session[‘id’]=$id;
session
Retrieving information from session
echo $_session[‘id’];
session
Retrieving information from session
$id=$_session[‘id’]; echo $id;
session
To register a session
session_register("id");
session Session_is_registered(id) Return true if register otherwise return false
session
Destroy a session
session_destroy();
Implementation of session To implementation you must start session at each page where session is being used To session start session_start() is used .It must be type above the tag or the top of the page
Implementation of session
If session has started successful you can store information in the session
Implementation of session An example to use session
Implementation of session
Implementation of session
Implementation of session
Destroy a session
Redirect to a page Header function is used to redirect header("location:index.php");
Redirect to a page
Problem with session
Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at D:\mysite\page 1 s.php:3) in D:\mysite\page 1 s.php on line 7
references
www.phpeasystep.com
A Basic Form (Design view)
A Basic Form (code view) How we do things with PHP: basicform.html
A Basic Form Weave HTML and PHP output.php
A Basic Form Capturing the data in output.php Variables: $_POST[‘name’] $_POST[‘age’]
Data Validation
We’ll talk more about validating user input later.
A Basic Form Outputting to the screen is nice, but boring We could email the results Let’s store data in a database
Layers of a Database Server Database Tables Fields/Columns Records Data
How to Get a Database
Request a MySQL Database
Request a MySQL Database You will need: Server name Database name Username Password
Connecting to DB from PHP Create one connection script: dbconn.php
?>
Connecting to DB from PHP Create one connection script: dbconn.php
?>
Connecting to DB from PHP Remember, “Be Lazy!” At the top of each file that needs the DB:
Database Table Table named ‘info’ has two fields, name and age Use a SQL INSERT statement: $sql = “INSERT INTO info (name,age) values (‘$name’, ‘$age’)”;
Database Table Send it to the Database: mysql_query($sql);
The Whole Picture dbinsert.php
require(“dbconn.php”); $name = $_POST[‘name’]; $age = $_POST[‘age’]; $sql = “INSERT into info (name,age) values(‘$name’, ‘$age’);” mysql_query($sql); ?> Thank you, your name and age were received.
The Whole Picture - Fancier fancydbinsert.php
HTML REVISITED Create a table by html use of simple formating Inclusion css
Create an Output Page Connect to the Server Do a query of the data Programmatically write the data to a page View the page in a browser Let’s see how to do it
Connect to the Server First, include our connection script:
Do a Query of the Data This time we use SELECT $sql = “SELECT name, age FROM info”; Or if you have many fields and want to be LAZY! $sql = “SELECT * from info”;
Programmatically Write the Data Here’s the only hard part:
| ”; echo $table->name; echo “ | ”; echo $table->age; echo “ | ”; } ?>
Putting it All Together statuspage.php
| ”; echo $table->name; echo “ | ”; echo $table->age; echo “ | ”; } ?>
| ”; echo $table[0]; echo “ | ”; echo $table[1]; echo “ | ”; } ?>
