Design Gala » PHP

How to Add Text in an Image

Design Gala — Thu, 15 Nov 2007 20:21:05 +0000

This small script describes how to add a custom text to an image loaded onto your page. One of my client wanted to add a copyright notice in her images related to her site. So, I came up with this small PHP script for her.

Adding Text to an Image

Using the PHP GD function called imagecreatefromjpeg, imagecreatefromgif and imagecreatefrompng. We can add a custom text to an already existing image file.
So you have imagecreatefromjpeg for jpeg file, imagecreatefrompng for png file and so on.

< ?php
header("Content-type: image/png");
$string = "copyright: some text";
$font = 4;
$width = imagefontwidth($font)* strlen($string) ;
$height = imagefontheight($font) ;

This will setup the structure of the data being sent to the image file as well as what location to place the text at. In this case we want to place it on the bottom right of the page.

Now, we use imagecreatefrompng to create image from a file, set the text color, get the images dimensions, and figure on where to place the text.

$im = imagecreatefrompng("/path/to/yourimagefile");
$x = imagesx($im) - $width ;
$y = imagesy($im) - $height;
 
$backgroundColor = imagecolorallocate ($im, 255, 255, 255);   //white background
$textColor = imagecolorallocate ($im, 0, 0, 0);   //black text
imagestring ($im, $font, $x, $y,  $string, $textColor);

Finally we produce the new image that will display custom text in an image.

imagepng ($im);
?>

Here is the complete code:

< ?php
header ("Content-type: image/png");
$string = "your text";
// try changing this as well
$font = 4;
$width = imagefontwidth($font) * strlen($string) ;
$height = imagefontheight($font) ;
$im = imagecreatefrompng("/path/to/yourimagefile");
$x = imagesx($im) - $width ;
$y = imagesy($im) - $height;
$backgroundColor = imagecolorallocate ($im, 255, 255, 255);
$textColor = imagecolorallocate ($im, 0, 0,0);
imagestring ($im, $font, $x, $y,  $string, $textColor);
imagepng($im);
?>

How to Get IP Address of Visitor

Design Gala — Tue, 15 May 2007 20:09:03 +0000

This is a simple PHP tutorials and script for getting remote visitors with their IP Address. With this tracking your visitor is very easy and simple with PHP. PHP has a set of global variables. Among them, we use $_SERVER variable to get an IP address of a remote computer. REMOTE_ADDR is the constant that is used to get the IP Address of a remote computer.

Note that this script may not return IP Address if the client/user firewall is on or when client is using some proxy software.

< ?php
 $ipaddress=$_SERVER["REMOTE_ADDR"];
 echo "Your IP ADDRESS: ". $ipaddress;
?>

Another way of retrieving IP Address is using function getenv().

< ?php
 $userip = $_SERVER["HTTP_X_FORWARDED_FOR"];
 $proxy = $_SERVER["REMOTE_ADDR"];
 $host = @gethostbyaddr($_SERVER["HTTP_X_FORWARDED_FOR"]);
?>

OUTPUT

Server IP ADDRESS: [exec]echo $_SERVER["HTTP_X_FORWARDED_FOR"];[/exec]
User IP ADDRESS: [exec]echo $_SERVER["REMOTE_ADDR"];[/exec]
User HOST ADDRESS: [exec]echo @gethostbyaddr($_SERVER["HTTP_X_FORWARDED_FOR"]);[/exec]

$userip is the IP address of the user thats been passed on by the server. $proxy is the IP address of the server itself and $host is the host address of the user. If your PHP version is less than 4.3 then use $HTTP_SERVER_VARS in place of $_SERVER

Download : PHP Script Get IP Address of Visitor

Email HTML page contents using PHP

Design Gala — Wed, 17 May 2006 14:50:44 +0000

Earlier post explained on how to send a plain email using PHP. This time, we are discussing about sending page contents to email. This technique is based on output buffering. Basically, it would first create read a html file and store in buffer using ob_start(). Next step is to include desire HTML page using include function and then store the contents of that HTML page using ob_get_contents(). Finally use mail() function to send email.

While output buffering is turned on no output is sent from then script. The output is stored in an internal buffer.

ob_start();
include_once("samplepage.html");
$buffer = ob_get_contents();
ob_end_clean();
 
$headers = 'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= 'From: '.SENDER_NAME.' <'.SENDER_EMAIL.'> ' . "\r\n";
 
$to_email = 'email@example.net';
$subject = 'Your Desired Email Subject';
 
mail($to_email, $subject, $buffer, $headers);

Download Sample

Creating Secure Login in PHP

Design Gala — Sat, 15 Apr 2006 21:57:24 +0000

This articles demonstrate and explains how to create a secure PHP login script that will allow safe authentication. Here, cookies are not used because of preventive measure against cross-side scripting. The back-end used is MySQL. So, you should have knowledge of MySQL and database as well.

Database Schema

For example lets make a table called login for this tutorial purpose only. For commercial purpose, please do add relevant attributes in the table. Use SQL below to create a table of login.

CREATE TABLE login (
user_name varchar(20) NOT NULL default '',
user_pass char(32) binary NOT NULL default '',
PRIMARY KEY (username)
);

Creating a HTML Form

<form method="post" action="login.php" name="login">
<input name="user_name" size="18" type="text" />
<input name="user_pass" size="18" type="text" />
<input name="submit" value="Login" type="submit" />
</form>

Handling Form

if(count($_POST) &gt; 0) {
 $user_name = htmlspecialchars($_POST["user_name"]);
 $user_pass = htmlspecialchars($_POST["user_pass"]);
 
 $sql = "SELECT user_name,user_pass FROM login
           WHERE user_name=\"$user_name\"
            AND    user_pass=\"$user_pass\"";
 
 $rs = mysql_query($sql);               //execute the query
 if(mysql_num_rows($rs)	==	1)  {
 	// username and passwords exists in database
       //other codes
 }
 else {
 	//invalid username of password
 	//redirect to login page
 
 	header("Location: login.php");
 }
 
}

Above is fairly a simple login page. We can add many other functionalities.

How to Send E-Mail using PHP

Design Gala — Mon, 13 Feb 2006 20:17:11 +0000

This article explains about sending a simple mail using PHP mail function.

Creating a Email Form using HTML

<form method="post" action="">
Sender Email: <input type="text" name="sender_email" size="18" />
Receipent Email: <input type="text" name="receipent_email" size="18" />
Mail Subject: <input type="text" name="email_subject" size="18" />
Email Message: <textarea name="message" rows="50" cols="6"></textarea>
<input type="submit" name="submit" value="Send Email" />
</form>

PHP Code For Handling Action and Send Email

if(count($_POST) > 0)
{
 $sender_email = $_POST["sender_email"];
 $receipent_email = $_POST["receipent_email"];
 $email_subject = $_POST["email_subject"];
 $message = $_POST["message"];
 $result = mail($receipent_email, $email_subject, $message,"From: $sender_email\n");
 if($result) {
    echo "Mail has been send successfully.";
 }
 else {
    echo "There was a problem in sending email.";
 }
}

This is just a method of how to send a simple email using PHP. In above script there is no way of proper error checking and other advance email functionalities like sending of HTML email, custom headers.