Pakistan's Urdu Forum For IT Education
 

Go Back   www.itilm.com > Information Technology Zone > English IT Zone
Forgot Password? Join Us!

English IT Zone Disussions, Share, Reviews, etc.. in English Language


Thread Title


What is PHP???

English IT Zone


Reply
Thread Starter Dia fayyaz Replies 17 Views 983  Show Printable Version | Email this Page | Subscription
share |
share topic
 
Thread Tools
  #1  
Old 11-20-2011, 03:46 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Arrow What is PHP???

Sponsored Links

PHP is a powerful tool for making dynamic and interactive Web pages.
PHP is the widely-used, free, and efficient alternative to competitors such as Microsoft's ASP.
In our PHP tutorial you will learn about PHP, and how to execute scripts on your server.


PHP is a server-side scripting language.
What You Should Already Know

Before you continue you should have a basic understanding of the following:
  • HTML/XHTML
  • JavaScript

What is PHP?

  • PHP stands for PHP: Hypertext Preprocessor
  • PHP is a server-side scripting language, like ASP
  • PHP scripts are executed on the server
  • PHP supports many databases (MySQL, Informix, Oracle, Sybase, Solid, PostgreSQL, Generic ODBC, etc.)
  • PHP is an open source software
  • PHP is free to download and use
What is a PHP File?

  • PHP files can contain text, HTML tags and scripts
  • PHP files are returned to the browser as plain HTML
  • PHP files have a file extension of ".php", ".php3", or ".phtml"
What is MySQL?

  • MySQL is a database server
  • MySQL is ideal for both small and large applications
  • MySQL supports standard SQL
  • MySQL compiles on a number of platforms
  • MySQL is free to download and use
PHP + MySQL

  • PHP combined with MySQL are cross-platform (you can develop in Windows and serve on a Unix platform)
Why PHP?

  • PHP runs on different platforms (Windows, Linux, Unix, etc.)
  • PHP is compatible with almost all servers used today (Apache, IIS, etc.)
  • PHP is FREE to download from the official PHP resource: www.php.net
  • PHP is easy to learn and runs efficiently on the server side
Where to Start?

To get access to a web server with PHP support, you can:
  • Install Apache (or IIS) on your own server, install PHP, and MySQL
  • Or find a web hosting plan with PHP and MySQL support
__________________
Reply With Quote
Sponsored Links
  #2  
Old 11-20-2011, 03:46 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

If your server supports PHP you don't need to do anything.
Just create some .php files in your web directory, and the server will parse them for you. Because it is free, most web hosts offer PHP support.
However, if your server does not support PHP, you must install PHP.
Here is a link to a good tutorial from PHP.net on how to install PHP5: http://www.php.net/manual/en/install.php
Download PHP

Download PHP for free here: http://www.php.net/downloads.php
Download MySQL Database

Download MySQL for free here: http://www.mysql.com/downloads/
Download Apache Server

Download Apache for free here: http://httpd.apache.org/download.cgi
__________________
Reply With Quote
  #3  
Old 11-20-2011, 03:46 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

PHP code is executed on the server, and the plain HTML result is sent to the browser.
Basic PHP Syntax

A PHP scripting block always starts with <?php and ends with ?>. A PHP scripting block can be placed anywhere in the document.
On servers with shorthand support enabled you can start a scripting block with <? and end with ?>.
For maximum compatibility, we recommend that you use the standard form (<?php) rather than the shorthand form.
<?php
?>

A PHP file normally contains HTML tags, just like an HTML file, and some PHP scripting code.
Below, we have an example of a simple PHP script which sends the text "Hello World" to the browser:
<html>
<body>

<?php
echo "Hello World";
?>

</body>
</html>

Each code line in PHP must end with a semicolon. The semicolon is a separator and is used to distinguish one set of instructions from another.
There are two basic statements to output text with PHP: echo and print. In the example above we have used the echo statement to output the text "Hello World".
Note: The file must have a .php extension. If the file has a .html extension, the PHP code will not be executed.
Comments in PHP

In PHP, we use // to make a single-line comment or /* and */ to make a large comment block.
<html>
<body>

<?php
//This is a comment

/*
This is
a comment
block
*/
?>

</body>
</html>

__________________
Reply With Quote
  #4  
Old 11-20-2011, 03:47 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

A variable is used to store information.
Variables in PHP

Variables are used for storing values, like text strings, numbers or arrays.
When a variable is declared, it can be used over and over again in your script.
All variables in PHP start with a $ sign symbol.
The correct way of declaring a variable in PHP:
$var_name = value;

New PHP programmers often forget the $ sign at the beginning of the variable. In that case it will not work.
Let's try creating a variable containing a string, and a variable containing a number:
<?php
$txt="Hello World!";
$x=16;
?>


PHP is a Loosely Typed Language

In PHP, a variable does not need to be declared before adding a value to it.
In the example above, you see that you do not have to tell PHP which data type the variable is.
PHP automatically converts the variable to the correct data type, depending on its value.
In a strongly typed programming language, you have to declare (define) the type and name of the variable before using it.
In PHP, the variable is declared automatically when you use it.
Naming Rules for Variables

  • A variable name must start with a letter or an underscore "_"
  • A variable name can only contain alpha-numeric characters and underscores (a-z, A-Z, 0-9, and _ )
  • A variable name should not contain spaces. If a variable name is more than one word, it should be separated with an underscore ($my_string), or with capitalization ($myString)
__________________
Reply With Quote
  #5  
Old 11-20-2011, 03:47 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

A string variable is used to store and manipulate text.
String Variables in PHP

String variables are used for values that contain characters.
In this chapter we are going to look at the most common functions and operators used to manipulate strings in PHP.
After we create a string we can manipulate it. A string can be used directly in a function or it can be stored in a variable.
Below, the PHP script assigns the text "Hello World" to a string variable called $txt:
<?php
$txt="Hello World";
echo $txt;
?>

The output of the code above will be:
Hello World

Now, lets try to use some different functions and operators to manipulate the string.
The Concatenation Operator

There is only one string operator in PHP.
The concatenation operator (.) is used to put two string values together.
To concatenate two string variables together, use the concatenation operator:
<?php
$txt1="Hello World!";
$txt2="What a nice day!";
echo $txt1 . " " . $txt2;
?>

The output of the code above will be:
Hello World! What a nice day!

If we look at the code above you see that we used the concatenation operator two times. This is because we had to insert a third string (a space character), to separate the two strings.

The strlen() function

The strlen() function is used to return the length of a string.
Let's find the length of a string:
<?php
echo strlen("Hello world!");
?>

The output of the code above will be:
12

The length of a string is often used in loops or other functions, when it is important to know when the string ends. (i.e. in a loop, we would want to stop the loop after the last character in the string).
The strpos() function

The strpos() function is used to search for a character/text within a string.
If a match is found, this function will return the character position of the first match. If no match is found, it will return FALSE.
Let's see if we can find the string "world" in our string:
<?php
echo strpos("Hello world!","world");
?>

The output of the code above will be:
6

The position of the string "world" in the example above is 6. The reason that it is 6 (and not 7), is that the first character position in the string is 0, and not 1.
Complete PHP String Reference

For a complete reference of all string functions, go to our complete PHP String Reference.
The reference contains a brief description, and examples of use, for each function!
__________________
Reply With Quote
  #6  
Old 11-20-2011, 03:48 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

Operators are used to operate on values.
PHP Operators

This section lists the different operators used in PHP.
Arithmetic Operators
Operator Description Example Result + Addition x=2
x+2 4 - Subtraction x=2
5-x 3 * Multiplication x=4
x*5 20 / Division 15/5
5/2 3
2.5 % Modulus (division remainder) 5%2
10%8
10%2 1
2
0 ++ Increment x=5
x++ x=6 -- Decrement x=5
x-- x=4 Assignment Operators
Operator Example Is The Same As = x=y x=y += x+=y x=x+y -= x-=y x=x-y *= x*=y x=x*y /= x/=y x=x/y .= x.=y x=x.y %= x%=y x=x%y Comparison Operators
Operator Description Example == is equal to 5==8 returns false != is not equal 5!=8 returns true <> is not equal 5<>8 returns true > is greater than 5>8 returns false < is less than 5<8 returns true >= is greater than or equal to 5>=8 returns false <= is less than or equal to 5<=8 returns true Logical Operators
Operator Description Example && and x=6
y=3 (x < 10 && y > 1) returns true
|| or x=6
y=3 (x==5 || y==5) returns false
! not x=6
y=3 !(x==y) returns true
__________________
Reply With Quote
  #7  
Old 11-20-2011, 03:49 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

Conditional statements are used to perform different actions based on different conditions.
Conditional Statements

Very often when you write code, you want to perform different actions for different decisions.
You can use conditional statements in your code to do this.
In PHP we have the following conditional statements:
  • if statement - use this statement to execute some code only if a specified condition is true
  • if...else statement - use this statement to execute some code if a condition is true and another code if the condition is false
  • if...elseif....else statement - use this statement to select one of several blocks of code to be executed
  • switch statement - use this statement to select one of many blocks of code to be executed
The if Statement

Use the if statement to execute some code only if a specified condition is true.
Syntax

if (condition) code to be executed if condition is true; The following example will output "Have a nice weekend!" if the current day is Friday:
<html>
<body>

<?php
$d=date("D");
if ($d=="Fri") echo "Have a nice weekend!";
?>

</body>
</html>
Notice that there is no ..else.. in this syntax. The code is executed only if the specified condition is true.
The if...else Statement

Use the if....else statement to execute some code if a condition is true and another code if a condition is false.
Syntax

if (condition)
code to be executed if condition is true;
else
code to be executed if condition is false;
Example

The following example will output "Have a nice weekend!" if the current day is Friday, otherwise it will output "Have a nice day!":
<html>
<body>

<?php
$d=date("D");
if ($d=="Fri")
echo "Have a nice weekend!";
else
echo "Have a nice day!";
?>

</body>
</html>
If more than one line should be executed if a condition is true/false, the lines should be enclosed within curly braces:
<html>
<body>

<?php
$d=date("D");
if ($d=="Fri")
{
echo "Hello!<br />";
echo "Have a nice weekend!";
echo "See you on Monday!";
}
?>

</body>
</html>
The if...elseif....else Statement

Use the if....elseif...else statement to select one of several blocks of code to be executed.
Syntax

if (condition)
code to be executed if condition is true;
elseif (condition)
code to be executed if condition is true;
else
code to be executed if condition is false;
Example

The following example will output "Have a nice weekend!" if the current day is Friday, and "Have a nice Sunday!" if the current day is Sunday. Otherwise it will output "Have a nice day!":
<html>
<body>

<?php
$d=date("D");
if ($d=="Fri")
echo "Have a nice weekend!";
elseif ($d=="Sun")
echo "Have a nice Sunday!";
else
echo "Have a nice day!";
?>

</body>
</html>
__________________
Reply With Quote
  #8  
Old 11-20-2011, 03:50 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

Conditional statements are used to perform different actions based on different conditions.
The PHP Switch Statement

Use the switch statement to select one of many blocks of code to be executed.
Syntax

switch (n)
{
case label1:
code to be executed if n=label1;
break;
case label2:
code to be executed if n=label2;
break;
default:
code to be executed if n is different from both label1 and label2;
}
This is how it works: First we have a single expression n (most often a variable), that is evaluated once. The value of the expression is then compared with the values for each case in the structure. If there is a match, the block of code associated with that case is executed. Use break to prevent the code from running into the next case automatically. The default statement is used if no match is found.
Example

<html>
<body>

<?php
switch ($x)
{
case 1:
echo "Number 1";
break;
case 2:
echo "Number 2";
break;
case 3:
echo "Number 3";
break;
default:
echo "No number between 1 and 3";
}
?>

</body>
</html>
__________________
Reply With Quote
  #9  
Old 11-20-2011, 03:51 PM
lovebank's Avatar
lovebank lovebank is offline
V.I.P
 
Join Date: Nov 2010
Posts: 14,377 -- Threads: 6794
Rep Power: 23
lovebank is on a distinguished road
Default Re: What is PHP???

بہت محنت سے تھریڈ بنائی ہے بہت شکریہ نائس ورک سسٹر
Reply With Quote
  #10  
Old 11-20-2011, 04:20 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

Thank u Bhaiya
__________________
Reply With Quote
  #11  
Old 11-22-2011, 09:54 AM
*QAMAR_RK*'s Avatar
*QAMAR_RK* *QAMAR_RK* is offline
V.I.P
 
Join Date: Mar 2011
Location: کہیں آس پاس
Posts: 13,899 -- Threads: 660
Rep Power: 22
*QAMAR_RK* is on a distinguished road
Default Re: What is PHP???

ہمممم یہ ہے تو کام کا مگر
یہ بہت سی سائٹ پر ہےجس کی وجی سے آپ کوئی چیز
سیو نہیں کرسکتے کیوں کے اسکا ٹیکسٹ پی ایچ پی میں
ہوتا ہے۔
شکریہ شیئر کرنے کے لیے ۔
Reply With Quote
  #12  
Old 08-02-2012, 04:29 PM
IT╬EXPERT's Avatar
IT╬EXPERT IT╬EXPERT is offline
V.I.P
 
Join Date: Mar 2012
Posts: 24,015 -- Threads: 782
Rep Power: 42
IT╬EXPERT has much to be proud ofIT╬EXPERT has much to be proud ofIT╬EXPERT has much to be proud ofIT╬EXPERT has much to be proud ofIT╬EXPERT has much to be proud ofIT╬EXPERT has much to be proud ofIT╬EXPERT has much to be proud ofIT╬EXPERT has much to be proud of
Default Re: What is PHP???

بہت ہی عمدہ شئیرنگ کی ہے
مزید اچھی اچھی شئیرنگ کا سلسلہ جاری رکھیں
بہت بہت شکریہ۔
__________________



Reply With Quote
  #13  
Old 11-11-2013, 06:06 PM
IQBAL HASSAN's Avatar
IQBAL HASSAN IQBAL HASSAN is offline
Moderator
 
Join Date: Apr 2013
Location: G-9/2,ISLAMABAD.
Age: 34
Posts: 5,787 -- Threads: 886
Rep Power: 12
IQBAL HASSAN is on a distinguished road
Default Re: What is PHP???


great sharing
thanks for nice sharing
__________________
Reply With Quote
  #14  
Old 05-04-2014, 04:34 PM
smartyounus's Avatar
smartyounus smartyounus is offline
(♥ Owner ♥)
 
Join Date: May 2010
Location: کرا چی
Posts: 24,014 -- Threads: 1961
Rep Power: 10
smartyounus will become famous soon enough
Default Re: What is PHP???



ہمارے ساتھ شیئر کر نے کا شکریہ آ پ کے اگلی شئیرنگ کا انتظا ر رہے گا





__________________



You Are Being Observed

Reply With Quote
  #15  
Old 02-02-2015, 03:51 PM
Hira Hasan Hira Hasan is offline
Junior Member
 
Join Date: Jan 2015
Age: 28
Posts: 4 -- Threads: 1
Rep Power: 0
Hira Hasan is on a distinguished road
Default Re: What is PHP???

or one can use wamp for local hosting
Reply With Quote
  #16  
Old 02-10-2015, 10:20 PM
Dia fayyaz's Avatar
Dia fayyaz Dia fayyaz is offline
ITI Queen
 
Join Date: May 2010
Location: ๑۩๑ United Arab Emirates ๑۩๑
Posts: 7,351 -- Threads: 668
Rep Power: 17
Dia fayyaz is on a distinguished road
Default Re: What is PHP???

Quote:
Originally Posted by Hira Hasan View Post
or one can use wamp for local hosting

Pasand Karnay ka shukriya Dear
__________________
Reply With Quote
  #17  
Old 02-10-2015, 10:37 PM
Sheikh Laeeq's Avatar
Sheikh Laeeq Sheikh Laeeq is offline
Super Moderator
 
Join Date: Dec 2012
Location: Multan
Age: 30
Posts: 9,844 -- Threads: 846
Rep Power: 17
Sheikh Laeeq will become famous soon enoughSheikh Laeeq will become famous soon enough
Default Re: What is PHP???

buht khoob sister
buht achi trha smjhaya hai apne
thanks for sharing
__________________
Reply With Quote
  #18  
Old 06-27-2019, 08:42 PM
jiaa jiaa is offline
Junior Member
 
Join Date: Jun 2019
Posts: 3 -- Threads: 0
Rep Power: 0
jiaa is on a distinguished road
Default Re: What is PHP???

I dont know
Reply With Quote
Reply


Tags
dia, fayyaz, php


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 

(View-All Members who have read this thread : 20
*QAMAR_RK*, anwar_hussain, arshadwarsi, Bilalmughal_18, Dia fayyaz, faisal2371015, Hira Hasan, IQBAL HASSAN, IT╬EXPERT, Jam786, jiaa, lovebank, Mrheart100, Rania, s4saad, saboorchundrigar, Sheikh Laeeq, smartyounus, Zara1122, ZIDI RAJPOOT
Thread Tools


Login

Flag Counter


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Copyright © 2010- 2019, Itilm.com, All Rights Reserved