$array should be pretty self explanatory, this is the array that you would like to insert an element into. $value, is the vale that you would like to insert, this can be any data type. Last is $index, $index is where you want to place the new value within the array. Remember that the first element in an array starts with an index of 0.

function arrayInsert($array, $value, $index){
	//Loops through array pushing everything back one
	for($i = count($array)-1; $i >= $index; $i--)
		$array[$i+1] = $array[$i];
	//Inserts the new value
	$array[$index] = $value;
	return $array;
}

The next snippet is arrayRemove, arrayRemove will remove an element from an array and then move all the elements after the removed element up one. There are two parameters that are needed for this method, $array which is the $array you want to remove from and $index which is the element index in the array you want to remove.

function arrayRemove($array, $index){
	//Loops through array pushing everything up one
	for($i = $index; $i < count($array)-1; $i++)
		$array[$i] = $array[$i+1];
	//Unsets the last value because it's nolonger needed
	unset($array[count($array)-1]);
	return $array;
}

Getting Started

Before we do anything lets set the header content-type to image/jpeg, to do this add the follow one line of code to the top of your PHP file.

header ("Content-type: image/jpeg");

Now that we have told PHP what it is exactly that we will be displaying, we can start to gather the user’s information.

$ip = $_SERVER['REMOTE_ADDR'];
$hostaddress = gethostbyaddr($ip);
$browser = $_SERVER['HTTP_USER_AGENT'];

/*wordwrap() will add a new line symbol after a specified amount
of characters, in our case 50*/
$browser = wordwrap($browser,50, "\n");

/*After we create the new lines we will need to explode the
$browser string into an array. (see more later)*/
$browser = explode("\n", $browser);

$ip: This should be pretty self explanatory, it’s the user’s IP address
$hostaddress: The internet host name corresponding to a given IP address
$browser: All kinds of information on the user’s browser

Creating The Image

Next, we need to create an image from an existing image and what better way to do that than with imageCreateFromJPEG(). While we are at it lets set our font color, I have chosen plain black but feel free to change it to fit your needs.

//Create a new image from board.jpg
$img_handle = imageCreateFromJPEG("board.jpg");
//Font color (in RGB format)
$color = ImageColorAllocate ($img_handle, 0, 0, 0);

Adding The Text

Finally, we can start add in the text.

//ImageString (image, font, x-position, y-position,  "text", font color);

ImageString ($img_handle, 3, 20, 20,  "Your IP: $ip", $color);
ImageString ($img_handle, 3, 20, 40,  "Your Host Address: $hostaddress", $color);
ImageString ($img_handle, 3, 20, 60,  "Your Browser: ", $color);

What I did here is was just create three lines of text using ImageString(). If you want to know more about ImageString try checking the PHP manual

You may have noticed that we never added in the users browser information, there’s a good reason for that. ImageString doesn’t support multiple lines of text, so if you remember from before we split $browser into and array of lines. So now all we have to do is loop through the array and print the lines one by one.

for($i = 0; $i < count($browser); $i++)
	ImageString ($img_handle, 3, 35, 80+($i*20), $browser[$i], $color);

Display The Image

Finally we have came to the last step, that is to display the image and then free any memory that we may have used while creating the image.
To do this all we need is the two simple lines below.

ImageJpeg ($img_handle, null, 100);
ImageDestroy ($img_handle);

You call the image the same way that you would any other, but instead of .jpg, .png, or whatever it's .php.

Final Code

header ("Content-type: image/jpeg");

$ip = $_SERVER['REMOTE_ADDR'];
$hostaddress = gethostbyaddr($ip);
$browser = $_SERVER['HTTP_USER_AGENT'];

$browser = wordwrap($browser,50, "\n");
$browser = explode("\n", $browser);

$img_handle = imageCreateFromJPEG("board.jpg");
$color = ImageColorAllocate ($img_handle, 0, 0, 0);

ImageString ($img_handle, 3, 20, 20,  "Your IP: $ip", $color);
ImageString ($img_handle, 3, 20, 40,  "Your Host Address: $hostaddress", $color);
ImageString ($img_handle, 3, 20, 60,  "Your Browser: ", $color);

for($i = 0; $i < count($browser); $i++)
	ImageString ($img_handle, 3, 35, 80+($i*20), $browser[$i], $color);

ImageJpeg ($img_handle, null, 100);
ImageDestroy ($img_handle);