Some basic tutorial for PHP beginners

al-zabir · #1 (**permalink**) 11-19-2007, 09:14 AM

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

Let's try creating a variable with a string, and a variable with a number:

PHP Code:


			
<?php
$txt = "Hello World!";
$number = 16;
?>

Displaying variable in php is very easy. Here is an example ---

PHP Code:

PHP Code:


			
<?php 
$txt = "Hello World!"; 
$number = 16; 

echo $txt; 
echo $number; 
?>

Result:

Quote:

Hello World!16

Displaying variables with string in php is also very easy. Here is an example ---

PHP Code:


			
<?php  
$txt = "Hello World!";  
$number = 16;  

echo "$txt is text<br>$number is Number";  

?>

Result:

Quote:

Hello World! is text
16 is Number

You can use PHP and HTML together. For this you just use <? and ?> tag within those you will write your php code. But your page extention must be .php. Let's try the following example --

PHP Code:


			
<html> 
<head><title>Test page with php+html</title></head> 
<body> 

<?php 
echo "Welcome to test page"; 
?> 

</body> 
</html>

If..Else is a common condition function for php.

Structure of If..Else ( Single Condition )

Code:

Quote:

if(condition)
statement1;
else
statement2;

Example ( Single Condition )

PHP Code:

Code:

if($i==1) 
$i=$i+1; 
else 
$i=$i-1;

Structure of If..Else ( Multiple Condition )

i

Quote:

f(condition){
statement1;
..
...
statementn;
}
else{
statement1;
..
...
statementn;
}

Example ( Multiple Condition )

PHP Code:


			
if($i==1){ 
$i=$i+1; 
$j=2; 
} 
else{ 
$i=$i-1; 
$j=3; 
}

For Loop is the mostly used loop function not only php but also any other language.

Structure of FOR LOOP:

Code:

Quote:

for(initialization; condition; increment/decrement)
{
statement1;
..
...
....
statementn;
}

Example of FOR LOOP:

PHP Code:


			
for($i=1; $i<=10; $i++) 
{ 
$a=$a+1; 
$n=$n+1; 
}

While loop in PHP:
==================

Structure:
=========

Quote:

intialization;
while(condition){
statement1;
statement2;
.
.
.
statementN;
loop factor;
}

Example:
=========

PHP Code:


			
$i=0;
while($i<=10){
echo "$i&nbsp;";
$i=$i+1;
}

Result:
=========

Quote:

0 1 2 3 4 5 6 7 8 9 10

Redirecting in PHP:
===============

Redirecting to any url from a php page is very easy task. Just a bit of use of a function is needed. Let's do it.

The following code will redirect user to the url "http://fahimgallery.freehostia.com"

Code:

<?
header('Location: http://fahimgallery.freehostia.com/');
?>

Note

Quote:

Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP.

Adding value of two variables in PHP
============================

Code:

<?
$a=1;
$b=2;
$c=$a+$b;
echo $c;
?>

Result:
============================

Code:

Concating Variables in PHP:
=======================
Concating variables in PHP needs just a dot(.) between two variables

Code:

Code:

<?
$var1='Hello';
$var2=' ';
$var3='World';
$final=$var1.$var2.$var3;
echo $final;
?>

Result:

Quote:

Hello World

Source: iGuides.org Webmasters Talk

A. Williams · #2 (**permalink**) 06-13-2008, 01:18 PM

hey i think i already mentioned in one of my posts that w3schools.com is really good for the php.......if its not yours visit the above mentioned site.