Well here are some cool variable effects.
Adding Multiple Strings
We can use strings to create great effects.
Example:
CODE
<?php
$var1="Hello person.";
$var2=str_replace("person","world",$var1);
echo $var1." ".$var2;
?>
$var1="Hello person.";
$var2=str_replace("person","world",$var1);
echo $var1." ".$var2;
?>
We used str_replace to show two sentences with strings.
Neat huh.
Random Integers
This is one of the sweetest features of PHP. the rand() function. Here is a neat trick using this function.
Example
CODE
<?php
function exVar()
{
$num=rand(1,100);
if ($num<100)
{
echo "The number is less than 100.";
}
else
{
echo "The number is 100.";
}
}
exVar()
?>
function exVar()
{
$num=rand(1,100);
if ($num<100)
{
echo "The number is less than 100.";
}
else
{
echo "The number is 100.";
}
}
exVar()
?>
That will run the function and tell you if it is 100 or less. Great for guessing games.
MySQL Connect
With variables we make connecting to a MySQL database clean and simple
Most mysql connection codes are like this.
CODE
<?php
$localhost="localhost";
$name="username";
$password="password";
$database="db";
$connect=mysql_connect($localhost,$name,$password) or die(mysql_error());
mysql_db_select($database,$connect);
?>
$localhost="localhost";
$name="username";
$password="password";
$database="db";
$connect=mysql_connect($localhost,$name,$password) or die(mysql_error());
mysql_db_select($database,$connect);
?>
Simple huh! Variables make it look simpler and neater.
Superglobals
This is another awesome feature of PHP and variables. The $_POST and $_GET variables. We can use these to receive user input. We also can use the $_GET global to host a small website in ONE FILE.
$_POST is very widely used in registration scripts and chatboxes.
Example of $_GET
CODE
<?php
if ($_GET['var'] == 'var')
{
//Post some html/php stuff here
}
else
{
//post the main page code here
}
?>
if ($_GET['var'] == 'var')
{
//Post some html/php stuff here
}
else
{
//post the main page code here
}
?>
Example of $_POST
CODE
<?php
$name=$_POST['var'];
echo $name;
?>
<form action="page.php" method="post">
<input type="text" name="var" />
<input type="submit" value="Submit" />
</form>
$name=$_POST['var'];
echo $name;
?>
<form action="page.php" method="post">
<input type="text" name="var" />
<input type="submit" value="Submit" />
</form>
The first code gives us a one file site using the $_GET variable and If statements.
Our second code processes the form and prints the user input.
Thank you for reading my tutorial.
I am a newbie in PHP! PLease can you explain that how should we save it and this and that! Do you know how to make an upload script which can upload files to a database? PLease reply!
