Saturday, November 8, 2008

PHP $_POST

The $_POST variable is used to collect values from a form with
method="post".

The $_POST Variable

The $_POST variable is an array of variable names and values sent by the HTTP
POST method.

The $_POST variable is used to collect values from a form with method="post".
Information sent from a form with the POST method is invisible to others and has
no limits on the amount of information to send.

Example

<form action="welcome.php" method="post">
Enter your name: <input type="text" name="name" />
Enter your age: <input type="text" name="age" />
<input type="submit" />
</form>

When the user clicks the "Submit" button, the URL will not contain any form
data, and will look something like this:

http://www.w3schools.com/welcome.php

The "welcome.php" file can now use the $_POST variable to catch the form data
(notice that the names of the form fields will automatically be the ID keys in
the $_POST array):

Welcome <?php echo $_POST["name"]; ?>.<br />
You are <?php echo $_POST["age"]; ?> years old!

Why use $_POST?

Variables sent with HTTP POST are not shown in the URL
Variables have no length limit

However, because the variables are not displayed in the URL, it is not
possible to bookmark the page.

The $_REQUEST Variable

The PHP $_REQUEST variable contains the contents of both $_GET, $_POST, and
$_COOKIE.

The PHP $_REQUEST variable can be used to get the result from form data sent
with both the GET and POST methods.

Example

Welcome <?php echo $_REQUEST["name"]; ?>.<br />
You are <?php echo $_REQUEST["age"]; ?> years old!

PHP $_GET

The $_GET variable is used to collect values from a form with
method="get".

The $_GET Variable

The $_GET variable is an array of variable names and values sent by the HTTP
GET method.

The $_GET variable is used to collect values from a form with method="get".
Information sent from a form with the GET method is visible to everyone (it will
be displayed in the browser's address bar) and it has limits on the amount of
information to send (max. 100 characters).

Example

<form action="welcome.php" method="get">
Name: <input type="text" name="name" />
Age: <input type="text" name="age" />
<input type="submit" />
</form>

When the user clicks the "Submit" button, the URL sent could look something
like this:

http://www.w3schools.com/welcome.php?name=Peter&age=37

The "welcome.php" file can now use the $_GET variable to catch the form data
(notice that the names of the form fields will automatically be the ID keys in
the $_GET array):

Welcome <?php echo $_GET["name"]; ?>.<br />
You are <?php echo $_GET["age"]; ?> years old!

Why use $_GET?

Note: When using the $_GET variable all variable names and values are
displayed in the URL. So this method should not be used when sending passwords
or other sensitive information! However, because the variables are displayed in
the URL, it is possible to bookmark the page. This can be useful in some
cases.

Note: The HTTP GET method is not suitable on large variable values;
the value cannot exceed 100 characters.

The $_REQUEST Variable

The PHP $_REQUEST variable contains the contents of both $_GET, $_POST, and
$_COOKIE.

The PHP $_REQUEST variable can be used to get the result from form data sent
with both the GET and POST methods.

Example

Welcome <?php echo $_REQUEST["name"]; ?>.<br />
You are <?php echo $_REQUEST["age"]; ?> years old!

PHP Forms and User Input

The PHP $_GET and $_POST variables are used to retrieve
information from forms, like user input.

PHP Form Handling

The most important thing to notice when dealing with HTML forms and PHP is
that any form element in an HTML page will automatically be available to
your PHP scripts.

Form example:

<html>
<body>

<form action="welcome.php" method="post">
Name: <input type="text" name="name" />
Age: <input type="text" name="age" />
<input type="submit" />
</form>

</body>
</html>

The example HTML page above contains two input fields and a submit button.
When the user fills in this form and click on the submit button, the form data
is sent to the "welcome.php" file.

The "welcome.php" file looks like this:

<html>
<body>

Welcome <?php echo $_POST["name"]; ?>.<br />
You are <?php echo $_POST["age"]; ?> years old.

</body>
</html>

A sample output of the above script may be:

Welcome John.
You are 28 years old.

The PHP $_GET and $_POST variables will be explained in the next
chapters.

Form Validation

User input should be validated whenever possible. Client side validation is
faster, and will reduce server load.

However, any site that gets enough traffic to worry about server resources,
may also need to worry about site security. You should always use server side
validation if the form accesses a database.

A good way to validate a form on the server is to post the form to itself,
instead of jumping to a different page. The user will then get the error
messages on the same page as the form. This makes it easier to discover the
error.

PHP Functions

The real power of PHP comes from its functions.

In PHP - there are more than 700 built-in functions
available.

PHP Functions

In this tutorial we will show you how to create your own functions.

For a reference and examples of the built-in functions, please visit our href="http://www.w3schools.com/php/default.asp">PHP Reference.

Create a PHP Function

A function is a block of code that can be executed whenever we need
it.

Creating PHP functions:

All functions start with the word "function()"
Name the function - It should be possible to understand what the function
does by its name. The name can start with a letter or underscore (not a
number)
Add a "{" - The function code starts after the opening curly brace
Insert the function code
Add a "}" - The function is finished by a closing curly brace

Example

A simple function that writes my name when it is called:

<html>
<body>

<?php
function writeMyName()
  {
  echo "Kai Jim Refsnes";
  }

writeMyName();
?>

</body>
</html>

Use a PHP Function

Now we will use the function in a PHP script:

<html>
<body>

<?php
function writeMyName()
  {
  echo "Kai Jim Refsnes";
  }

echo "Hello world!<br />";
echo "My name is ";
writeMyName();
echo ".<br />That's right, ";
writeMyName();
echo " is my name.";
?>

</body>
</html>

The output of the code above will be:

Hello world!
My name is Kai Jim Refsnes.
That's right, Kai Jim Refsnes is my name.

PHP Functions - Adding parameters

Our first function (writeMyName()) is a very simple function. It only writes
a static string.

To add more functionality to a function, we can add parameters. A parameter
is just like a variable.

You may have noticed the parentheses after the function name, like:
writeMyName(). The parameters are specified inside the parentheses.

Example 1

The following example will write different first names, but the same last
name:

<html>
<body>

<?php
function writeMyName($fname)
  {
  echo $fname . " Refsnes.<br />";
  }

echo "My name is ";
writeMyName("Kai Jim");

echo "My name is ";
writeMyName("Hege");

echo "My name is ";
writeMyName("Stale");
?>

</body>
</html>

The output of the code above will be:

My name is Kai Jim Refsnes.
My name is Hege Refsnes.
My name is Stale Refsnes.

Example 2

The following function has two parameters:

<html>
<body>

<?php
function writeMyName($fname,$punctuation)
  {
  echo $fname . " Refsnes" . $punctuation . "<br />";
  }

echo "My name is ";
writeMyName("Kai Jim",".");

echo "My name is ";
writeMyName("Hege","!");

echo "My name is ";
writeMyName("Ståle","...");
?>

</body>
</html>

The output of the code above will be:

My name is Kai Jim Refsnes.
My name is Hege Refsnes!
My name is Ståle Refsnes...

PHP Functions - Return values

Functions can also be used to return values.

Example

<html>
<body>

<?php
function add($x,$y)
  {
  $total = $x + $y;
  return $total;
  }

echo "1 + 16 = " . add(1,16);
?>

</body>
</html>

The output of the code above will be:

1 + 16 = 17

PHP Looping

Looping statements in PHP are used to execute the same block of
code a specified number of times.

Looping

Very often when you write code, you want the same block of code to run a
number of times. You can use looping statements in your code to perform
this.

In PHP we have the following looping statements:

while - loops through a block of code if and as long as a specified
condition is true
do...while - loops through a block of code once, and then repeats
the loop as long as a special condition is true
for - loops through a block of code a specified number of times
foreach - loops through a block of code for each element in an
array

The while Statement

The while statement will execute a block of code if and as long as a
condition is true.

Syntax

while (condition)
code to be executed;

Example

The following example demonstrates a loop that will continue to run as long
as the variable i is less than, or equal to 5. i will increase by 1 each time
the loop runs:

<html>
<body>

<?php 
$i=1;
while($i<=5)
  {
  echo "The number is " . $i . "<br />";
  $i++;
  }
?>

</body>
</html>

The do...while Statement

The do...while statement will execute a block of code at least once -
it then will repeat the loop as long as a condition is true.

Syntax

do
{
code to be executed;
}
while (condition);

Example

The following example will increment the value of i at least once, and it
will continue incrementing the variable i as long as it has a value of less than
5:

<html>
<body>

<?php 
$i=0;
do
  {
  $i++;
  echo "The number is " . $i . "<br />";
  }
while ($i<5);
?>

</body>
</html>

The for Statement

The for statement is the most advanced of the loops in PHP.

In it's simplest form, the for statement is used when you know how many times
you want to execute a statement or a list of statements.

Syntax

for (init; cond; incr)
{
  code to be executed;
}

Parameters:

init: Is mostly used to set a counter, but can be any code to be
executed once at the beginning of the loop statement.
cond: Is evaluated at beginning of each loop iteration. If the
condition evaluates to TRUE, the loop continues and the code executes. If it
evaluates to FALSE, the execution of the loop ends.
incr: Is mostly used to increment a counter, but can be any code to
be executed at the end of each loop.

Note: Each of the parameters can be empty or have multiple expressions
separated by commas.

cond: All expressions separated by a comma are evaluated but the
result is taken from the last part. This parameter being empty means the loop
should be run indefinitely. This is useful when using a conditional break
statement inside the loop for ending the loop.

Example

The following example prints the text "Hello World!" five times:

<html>
<body>

<?php
for ($i=1; $i<=5; $i++)
{
  echo "Hello World!<br />";
}
?>

</body>
</html>

The foreach Statement

The foreach statement is used to loop through arrays.

For every loop, the value of the current array element is assigned to $value
(and the array pointer is moved by one) - so on the next loop, you'll be looking
at the next element.

Syntax

foreach (array as value)
{
    code to be executed;
}

Example

The following example demonstrates a loop that will print the values of the
given array:

<html>
<body>

<?php
$arr=array("one", "two", "three");

foreach ($arr as $value)
{
  echo "Value: " . $value . "<br />";
}
?>

</body>
</html>

PHP Arrays

An array can store one or more values in a single variable
name.

What is an array?

When working with PHP, sooner or later, you might want to create many similar
variables.

Instead of having many similar variables, you can store the data as elements
in an array.

Each element in the array has its own ID so that it can be easily
accessed.

There are three different kind of arrays:

Numeric array - An array with a numeric ID key
Associative array - An array where each ID key is associated with a
value
Multidimensional array - An array containing one or more arrays

Numeric Arrays

A numeric array stores each element with a numeric ID key.

There are different ways to create a numeric array.

Example 1

In this example the ID key is automatically assigned:

$names = array("Peter","Quagmire","Joe");

Example 2

In this example we assign the ID key manually:

$names[0] = "Peter";
$names[1] = "Quagmire";
$names[2] = "Joe";

The ID keys can be used in a script:

<?php

$names[0] = "Peter";
$names[1] = "Quagmire";
$names[2] = "Joe";

echo $names[1] . " and " . $names[2] . 
" are ". $names[0] . "'s neighbors";
?>

The code above will output:

Quagmire and Joe are Peter's neighbors

Associative Arrays

An associative array, each ID key is associated with a value.

When storing data about specific named values, a numerical array is not
always the best way to do it.

With associative arrays we can use the values as keys and assign values to
them.

Example 1

In this example we use an array to assign ages to the different persons:

$ages = array("Peter"=>32, "Quagmire"=>30, "Joe"=>34);

Example 2

This example is the same as example 1, but shows a different way of creating
the array:

$ages['Peter'] = "32";
$ages['Quagmire'] = "30";
$ages['Joe'] = "34";

The ID keys can be used in a script:

<?php

$ages['Peter'] = "32";
$ages['Quagmire'] = "30";
$ages['Joe'] = "34";

echo "Peter is " . $ages['Peter'] . " years old.";
?>

The code above will output:

Peter is 32 years old.

Multidimensional Arrays

In a multidimensional array, each element in the main array can also be an
array. And each element in the sub-array can be an array, and so on.

Example

In this example we create a multidimensional array, with automatically
assigned ID keys:

$families = array
(
  "Griffin"=>array
  (
  "Peter",
  "Lois",
  "Megan"
  ),
  "Quagmire"=>array
  (
  "Glenn"
  ),
  "Brown"=>array
  (
  "Cleveland",
  "Loretta",
  "Junior"
  )
);

The array above would look like this if written to the output:

Array
(
[Griffin] => Array
  (
  [0] => Peter
  [1] => Lois
  [2] => Megan
  )
[Quagmire] => Array
  (
  [0] => Glenn
  )
[Brown] => Array
  (
  [0] => Cleveland
  [1] => Loretta
  [2] => Junior
  )
)

Example 2

Lets try displaying a single value from the array above:

echo "Is " . $families['Griffin'][2] . 
" a part of the Griffin family?";

The code above will output:

Is Megan a part of the Griffin family?

PHP Switch Statement

The Switch statement in PHP is used to perform one of several
different actions based on one of several different conditions.

The Switch Statement

If you want to select one of many blocks of code to be executed, use the
Switch statement.

The switch statement is used to avoid long blocks of if..elseif..else
code.

Syntax

switch (expression)
{
case label1:
  code to be executed if expression = label1;
  break;  
case label2:
  code to be executed if expression = label2;
  break;
default:
  code to be executed
  if expression is different 
  from both label1 and label2;
}

Example

This is how it works:

A single expression (most often a variable) is evaluated once
The value of the expression is compared with the values for each case in
the structure
If there is a match, the code associated with that case is executed
After a code is executed, break is used to stop the code from
running into the next case
The default statement is used if none of the cases are true

<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>

PHP If...Else Statements

The if, elseif and else statements in PHP 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.

if...else statement - use this statement if you want to execute a
set of code when a condition is true and another if the condition is not true
elseif statement - is used with the if...else statement to execute
a set of code if one of several condition are true

The If...Else Statement

If you want to execute some code if a condition is true and another code if a
condition is false, use the if....else statement.

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 ElseIf Statement

If you want to execute some code if one of several conditions are true use
the elseif statement

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>

PHP Operators

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 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

PHP String

A string variable is used to store and manipulate a piece of
text.

Strings in PHP

String variables are used for values that contains character strings.

In this tutorial we are going to look at some of 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 string "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 our
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 variables together, use the dot (.) operator:

<?php
$txt1="Hello World";
$txt2="1234";
echo $txt1 . " " . $txt2;
?>

The output of the code above will be:

Hello World 1234

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.

Between the two string variables we added a string with a single character,
an empty space, to separate the two variables.

Using the strlen() function

The strlen() function is used to find the length of a string.

Let's find the length of our string "Hello world!":

<?php
echo strlen("Hello world!");
?>

The output of the code above will be:

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)

Using the strpos() function

The strpos() function is used to search for a string or character within a
string.

If a match is found in the string, this function will return the 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:

As you see the position of the string "world" in our string is position 6.
The reason that it is 6, and not 7, is that the first position in the string is
0, and not 1.

Complete PHP String Reference

For a complete reference of all string functions, go to our href="http://www.w3schools.com/php/php_ref_string.asp">complete PHP String
Reference.

The reference contains a brief description and examples of use for each
function!

PHP Variables

Variables are used for storing values, such as numbers, strings
or function results, so that they can be used many times in a script.

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;

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 with a string, and a variable with a
number:

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

PHP is a Loosely Typed Language

In PHP a variable does not need to be declared before being set.

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 how they are set.

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.

Variable Naming Rules

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 underscore ($my_string), or with
capitalization ($myString)

PHP Syntax

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 the .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>

PHP Installation

What do You Need?

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: href="http://www.php.net/manual/en/install.php"
target=_blank>http://www.php.net/manual/en/install.php

Download PHP

Download PHP for free here: target=_blank>http://www.php.net/downloads.php

Download MySQL Database

Download MySQL for free here: href="http://www.mysql.com/downloads/index.html"
target=_blank>http://www.mysql.com/downloads/index.html

Download Apache Server

Download Apache for free here: target=_blank>http://httpd.apache.org/download.cgi

PHP Intro

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
Some scripting knowledge

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: href="http://www.php.net/" target=_blank>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

Friday, November 7, 2008

What is PHP?

PHP is a scripting language originally designed for producing dynamic web pages. It has evolved to include a command line interface capability and can be used in standalone graphical applications.

While PHP was originally created by Rasmus Lerdorf in 1995, the main implementation of PHP is now produced by The PHP Group and serves as the de facto standard for PHP as there is no formal specification. Released under the PHP License, the Free Software Foundation considers it to be free software.

PHP is a widely-used general-purpose scripting language that is especially suited for web development and can be embedded into HTML. It generally runs on a web server, taking PHP code as its input and creating web pages as output. It can be deployed on most web servers and on almost every operating system and platform free of charge. PHP is installed on more than 20 million websites and 1 million web servers. The most recent major release of PHP was version 5.2.6 on May 1, 2008.

Subscribe To

My Blog List

Saturday, November 8, 2008

The $_POST Variable

Example

Why use $_POST?

The $_REQUEST Variable

Example

The $_GET Variable

Example

Why use $_GET?

The $_REQUEST Variable

Example

PHP Form Handling

Form Validation

PHP Functions

Create a PHP Function

Example

Use a PHP Function

PHP Functions - Adding parameters

Example 1

Example 2

PHP Functions - Return values

Example

Looping

The while Statement

Syntax

Example

The do...while Statement

Syntax

Example

The for Statement

Syntax

Example

The foreach Statement

Syntax

Example

What is an array?

Numeric Arrays

Example 1

Example 2

Associative Arrays

Example 1

Example 2

Multidimensional Arrays

Example

Example 2

The Switch Statement

Syntax

Example

Conditional Statements

The If...Else Statement

Syntax

Example

The ElseIf Statement

Syntax

Example

PHP Operators

Strings in PHP

The Concatenation Operator

Using the strlen() function

Using the strpos() function

Complete PHP String Reference

Variables in PHP

PHP is a Loosely Typed Language

Variable Naming Rules

Basic PHP Syntax

Comments in PHP

What do You Need?

Download PHP

Download MySQL Database

Download Apache Server

What You Should Already Know

What is PHP?

What is a PHP File?

What is MySQL?

PHP + MySQL

Why PHP?

Where to Start?

Friday, November 7, 2008