PHP and MySQL : Server Side Scripting For Web Development
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Transcript of PHP and MySQL : Server Side Scripting For Web Development
PHP and MySQL : Server Side
Scripting For Web Development
View PHP & MYSQL Course at: http://www.edureka.co/php-mysql
For more details please contact us: US : 1800 275 9730 (toll free)INDIA : +91 88808 62004Email Us : [email protected]
For Queries:Post on Twitter @edurekaIN: #askEdurekaPost on Facebook /edurekaIN
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Objectives
At the end of this module, you will be able to understand:
Basics of PHP
Conditional Logic and Loops
PHP Form Handling
PHP Functions
Object Oriented Concepts
Implement MySQL with PHP
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PHP & MySQL - Overview
PHP & MySQL is an open-source
PHP & MySQL are two key components in the open-source LAMP stack
It is the most appropriate tool for developing dynamic web pages. For example, we can develop informative forums, chatting platforms, e-commerce shopping carts, CRM solutions, community websites and database driven sites
PHP with MySQL is a powerful combination showing the real power of Server-Side scripting
PHP has a wide range of MySQL functions available with the help of a separate module
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Benefits of PHP & MySQL
PHP web development means developing websites and dynamic web pages using the versatile and capable server-side scripting language
CAPABLEPLATFORM
INDEPENDENT
SUPPORTS ALL MAJOR WEB
SERVERS
SUPPORTS ALL MAJOR DATABASES
FREE OF COST
FASTER DEVELOPMENTS
LARGE COMMUNITIES
EASYPROVEN AND
TRUSTED
SECURE
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Intricacies of PHP & MySQL
Dynamic and Weak Typing
Variable Variables
Dynamic Arrays
Dynamic Constants
Dynamic Functions
Dynamic Code
Dynamic Includes
Built-in Functions
Superglobals
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What is PHP?
PHP is the web development language written by and for web developers.
PHP stands for Hypertext Preprocessor.
It was originally named as Personal Home Page Tools and later on as Professional Home Page.
It is a server-side script, which can be embedded in HTML or used as a standalone program script.
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Script in PHP
PHP can be embedded in HTML or can be written as stand-alone program by using special markup tags. They are:
<?php//PHP code comes here
?>
We can write PHP script in always available Notepad or get some PHP specific IDE downloaded from internet.
We can call the file from web browser after saving it using .php extension in webserver directory.
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PHP Example
<html><head>
<title>PHP Example</title><body>
<?php echo “This is my first PHP script."; ?></body>
</html>
The rendered HTML of the above script looks like below:
<html><head>
<title>PHP Example</title><body>
<p> This is my first PHP script.</p></body>
</html>
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Environment Setup
To execute PHP script we need three components to be installed on our computer:
Web Server - PHP supports many web server, including Apache server and IIS.
Database - PHP supports many databases. But the extensively used is MySQL.
PHP Parser - A Parser is required to generate HTML output from PHP code.
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PHP Variables
A variable in any programming language is a name to store a value that can be referenced later as required.
In PHP, Variables are defined a name preceded by a dollar sign ($). Eg. $firstName, $last_Name etc.
The type of a variable depends upon the value of its values.
Equal to (=) operator is used to assign a value to a variable name, on the left-hand side and the value on the right-hand side.
In PHP, variables are not required to be declared before assigning a value.
Data type for a variables is not required to be declared for a variable in PHP. Depending upon the value it is automatically interpreted.
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Decision Making Statements
Statements that are used to perform certain functions depending on certain conditions are called Decision making statements as given below:
• If…else statement
• elseif statement
• Switch statement
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If-else Statement
<?phpIf($user == “Mohit”){
print “Hello Mohit.”;}else{
print “You are not Mohit.”;}
?>
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If-elseif Statement
<?phpif($day ==5) {
print(“Five team members. <br>”);} elseif($day ==4) {
print(“Four team members <br>”);} elseif($day ==3) {
print(“Three team members <br>”);} elseif($day ==2) {
print(“Two team members <br>”);} elseif($day ==1) {
print(“One team members <br>”);}
?>
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Switch Statement
<?phpswitch($day){
case 3:print(“Three golden rings <br>”);break;
case 2:print(“Two golden rings <br>”);break;
default:print(“One golden ring <br>”);
}?>
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Looping Statements
Following are the various looping statements in PHP:
• For loop
• Foreach loop
• While loop
• Do…while loop
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For Statement
A for statement execution starts with evaluation of initial-expression, which is initialization of counter variable .
Then evaluation of termination-check is done. if false, the for statement concludes, and if true, the statement executes.
Finally, the loop-end-expression is executed and the loop begins again with termination–check.
Example:
<?phpfor($counter=1 //initial expression$counter<4; //termination checks$counter++ //loop-end expressions) {
print(“$counter<br />”);}
?>
Result:
123
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Foreach Statement
We use foreach loop to iterate through arrays and objects.
Example:
<?php$months = array(“January", “February", “March", “April“, ”May”, ”June”, ”July”, ”August”, ”September”, ”October”, ”November”, ”December”);foreach ($months as $value) {
echo "$value <br>";}?>
Result:
JanuaryFebruaryMarchAprilMayJuneJulyAugust SeptemberOctoberNovemberDecember
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While Statement
The while loop evaluates the condition expression as Boolean. if true, it executes statements and then starts again by evaluating condition. If the condition is false, the loop terminates.
Example:
<?php$count=1;While($counter<=6){
print(“Counter value is $counter <br>”);$counter = $counter++;
}?>
Result:
Count value is 1Count value is 2Count value is 3Count value is 4Count value is 5Count value is 6
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Do-While Statement
The only difference between while and do-while is that the do-while will execute the statement at least once.
The statement is executed once, and then the expression is evaluated. If the expression is true, the statement is repeated until the expression becomes false.
Example:
<?php$counter=50;do {
print(“Counter value is $counter. <br>”);$counter = $counter + 1;
}While($counter<=10)?>
Result:
Counter value is 50.
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Break Statement
The break command exits from the inner most loop statements that contain it.
Example:
<?phpfor($x=1; $x<10; $x++) {
If($x % 2 !=0) {break;print(“$x “);
}}?>
Result:
The above code prints nothing because 1 is odd which terminates the for loop immediately.
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Continue Statement
The continue command skips to the end of the current iteration of the innermost loop that contains it.
Example:
<?phpfor($x=1; $x<10; $x++) {
if($x % 2 !=0) {continue;
}print(“$x “);
}?>
Result:
2 4 6 8Here, the continue statement will skip any of odd numbers. It will print only the even numbers.
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PHP Forms
Form is a web page which allows user to enter data.
Forms contains many elements like text box, text area, checkbox, radio button and submit button
User enters information in the form elements
And, the entered information are sent to the server for processing
Using HTML we can create forms and using PHP we can process form elements
Let us see an example in the upcoming slides
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HTML Form
See the below example for HTML form with two text boxes and one submit button
<html><body><form action=“save.php" method="post">First Name: <input type="text" name=“firstname"><br>Last Name: <input type="text" name=“lastname"><br><input type="submit"></form></body>
</html>
The user enters the above information and clicks the submit button, the information is sent to a file called “save.php”
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Processing Forms
The form data is sent to a PHP file for processing
We can send form data to server using two methods• GET method• POST method
In the previous code, we used POST method to send data. See the below example, to display the submitted data. To print the values, use the below code in save.php
<?phpYour First name is: <?php echo $_POST["firstname"]; ?><br>Your Lastname is: <?php echo $_POST["lastname"]; ?>?>
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Get Method
GET method passes argument from one page to the next page.
It appends the indicated variable name(s) and values(s) to the URL. The value and the page name separated by question-mark(?)
<form action=“display.php” method=“get”>Name: <input type=“text” name=“name”><br/>Email:<input type=“text” name=“email”><br/><input type=“submit” value=“submit”>
</form>
<?phpecho “Name: ”.$_GET*‘name’+;echo “Email: ”.$_GET*‘email’+;?>
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Get Method (Continued)
Advantage:
• It constructs an actual new and differentiable URL query string. Users can now bookmark this page
Disadvantage:
• The GET method is not suitable for logins because the username and password are fully visible onscreen as well as potentially stored in the client browser’s memory as a visited page
• Every GET submission is recorded in the web server log, data set included
• Because the GET method assigns data to a server environment variable, the length of the URL is limited
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Post Method
POST is the preferred method of form submission
The form data is included in the body of the form when it is forwarding to the processing agent. There will be no change in the URL
<form action=“display.php” method=“post”>Name: <input type=“text” name=“name”><br/>Email:<input type=“text” name=“email”><br/><input type=“submit” value=“submit”>
</form>
POST Method data can be accessed using $_POST variable
<?phpecho “Name: ”.$_POST*‘name’+;echo “Email: ”.$_POST*‘email’+;?>
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Post Method (Continued)
Advantages:
• It is more secure than GET because user-entered information is never visible in the URL
• It is much larger limit on the amount of data than can be passed
Disadvantages:
• The results at a given moment cannot be bookmarked
• This methods can be incompatible with certain firewall setups, which strip the form data as a security measure
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PHP Functions
A function is a set of codes which are used to perform some specific tasks
Its main advantage is reusability. Instead of defining a code repeatedly, we can create functions and use them when needed
The function will not execute directly when the program loads. We need to call a function
There are two types of function available in PHP
• Built-in functions - The real power of PHP is its functions. PHP has more than 1000 built-in functions. They can be invoked directly
• User defined functions - We can also create our own functions. We will discuss about the creation of our own functions in next slide
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PHP Functions Syntax
Example:
function functionName() {set of code to be executed;
}
Syntax to call a function:
functionName();
Rules to follow while naming a function:
• Function names are NOT case-sensitive• Function name starts with a letter or underscore• Function name cannot start with numbers
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PHP Functions Return Value
Function can return a value. It will return one value or more than one value using array
It returns the value using the return keyword. If the return statement is found in the function it will stop execution and send the value to the callback function.
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Function Parameters
Function parameters are variables passes to the function inside the parentheses. They are declared much like a typical variable would be:
<?php// multiply a value by 10 and return it to the callerfunction multiply ($value) {
$value = $value * 10;return $value;
}$retval= multiply (10);Print "Return value is $retval\n";?>
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Object Oriented Concepts
Object Oriented Programming (OOP) is a programming concept used to design our application
• Applications can be of any type
• Web based application
• Window based application
• It is used to write programming in object model structure
Advantages of Object Oriented Programming
• Re-Usability of your code
• Easy to Maintain
• Good Level of Abstraction
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Classes
Defining PHP Classes
• Class is a user defined data type which includes functions and member variables • It is used to define object. It is the blueprint of the object
Class Declaration
• Class is declared using class keyword followed by the name• A set of braces used to declare variables and functions• Variables can be declared using var keyword followed by $
<?phpclass classname {
var$var1;var$var2 = "constant text";function myfunc($arg1, $arg2) {
//function code}
}?>
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Creating Objects in PHP
In Object Oriented language, properties are called member variables. And, behaviors are called member functions
• Once we defined our class, then we can create as many objects using the new operator• Pen is class, Hero pen, Reynolds etc are called its objects
Syntax
$objectname= new classname();
Example:
$hero = new Pen;$reynolds= new Pen;
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Calling Member Functions
After creating objects, we can access our member functions
We can only access the member function of the class of which we created objects
Let us see how to access member functions using the objects $hero, $reynolds
ExampleAssigning values to the object $hero by accessing its member functions
$hero -> setPrice("100"); //assigns value 100 to price variable$hero -> setColor("Green"); //assigns value green to color variable$hero -> setType("Ink Pen"); //assigns value Ink Pen to type variable$hero -> setWritingcolor(“blue”); //assigns value blue to writing color of the pen
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Constructor Functions
Constructor is a special type of function
It is automatically invoked when an object is created. So we can use this function for initialization
To define a constructor, PHP provides a special function called __construct(). We can pass any number of arguments to this function
A function can also become a constructor, if it defined by the same name of the class
Two ways to declare constructors• __construct() function• Define function using same class name
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Constructor Functions (Continued)
Method 1:class classname{
function __construct(p1, p2, ..., pN]){/* Class initialization code */
}}
Method 2:class classname{
function classname(p1, p2, ..., pN]){/* Class initialization code */
}}
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Inheritance
Inheritance is the method of inheriting one class properties to other class
We can achieve this by using ‘extends’ keyword
Class parentclass{//parent class definition}
Class childclass extends parentclass{//child class definition
}
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Function Overriding
Function overriding is nothing but overriding the function of parent class to child class and modify those functions
Using overriding, we can alter function definition in child class
To override, we need to create same function in sub class which it is in base class
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class baseclass {public function one() {
echo “First function”;}public function two() {
echo “second function”;}
}
class childclass extends baseclass {function two($text) //overriding function2{
echo "$text ";}
}$text = new childclass();$text->two("Sachin");//it will print Sachin
Function Overriding
Example:
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Access Modifiers
Access modifiers is nothing but the level of access and the visibility of the member variables and member functions
We can use this access modifiers to show or hide data
We have three access modifiers in PHP
• Private• Protected• Public
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Final Keyword
Final is a keyword
If we define the class as final then we cannot extend the class
If we declare the method as final we cannot override the method
Syntax for Defining Function as Final
final public function functioname() {//function definition comes here
}
Syntax for Defining Class as Final
final class classname{//class definition comes here
}
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Database
A database is a unique application that organizes a group of data
Each database application has one or more APIs for creating, managing, accessing, searching and duplicating the data it holds
Hence, the data can easily be accessed, managed, and updated
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MySQL Introduction
MySQL is a database system which is used on the web and runs on the server
It uses standard SQL
It is very fast, reliable and easy to use and also it is ideal for both small and large applications
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MySQL Connection
Using PHP Script
• Using mysql_connect() function we can open a database connection• This function requires five parameters and all are optional
Syntax
mysql_connect(server,user,pass,new_link,client_flag);
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MySQL Disconnect
Using PHP Script
• Using mysql_close() function we can disconnect from MySQL server • This function takes single parameter
Syntax
mysql_close(resource $link_identifier);
If we did not specify any parameter then the last opened database is closed
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Execute MySQL Queries
Using PHP function mysql_query() we can run a MySQL query.
This function needs two parameters and returns Boolean value
Function Syntax
mysql_query(sql_query, connection);
First parameter is mandatory. sql_query parameter is mandatory. It specifies the original query to be executed
The second parameter is optional. It is the connection parameter. If we did not specified, it takes the last opened connection
Consider we are going to create a database ‘student_details’ to store student information
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Fetching Data
Select Query
• Data Manipulation –Select Query• Select statement is used to fetch data from the database• Fetching data can be simple queries or complex queries
To select data using PHP script, we can use mysql_query() function
• Write the select query inside the mysql_query() function• This function is used to execute MySQL queries• To fetch the selected data using select query we can use two functions
mysql_fetch_array()mysql_fetch_assoc()
Questions
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Course Topics
Module 1 » PHP Basics and Conditional Logic
Module 2» Functions and Error Handling
Module 3 » Object Oriented Programming
Module 4 » MySQL Installation and Basics
Module 5 » Advance Queries and Data Manipulation
using PHP
Module 6 » MVC Infrastructure Basics & Introduction to
CakePHP
Module 7 » CakePHP Controller, Views and Layout
Module 8» Models and Database Interaction in CakePHP
Module 9» Creating Dynamic Forms using CakePHP Html
Helpers
Module 10» Using MVC & CakePHP to develop a website
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