PHP | Adding text over an image

In order to add text over an image, following PHP code can be used. Read the comments to understand purpose of code statements:

<?php
header ("Content-type: image/jpeg"); //setting the content type

 //variable containing the string to be written on the image
$txt = "Here goes the text to be placed on the image";  

$fontSize = 6; 		// sets size of the text as per need
 
/*below line sets pixel width of the section where the string would be placed. Imagefontwidth() returns the pixel width of a character by using the font size manually set by us in previous line. We would multiply it by total number of characters in the $txt variable to get the complete width of the string to be printed on image.*/
$widthX = imagefontwidth($fontSize) * strlen($txt) ; 
 
//Similarly, this line sets pixel height of the section where the string would be placed.
$heightY = imagefontheight($fontSize) ; 
 
// converts the argument file into a jpg image 
$img = imagecreatefromjpeg("Image.jpg");  

//setting X coordinates by subtracting the pixel width of the string from width of the image calculated using imagesx().
$xCoords = imagesx($img) - $widthX ; 
 
//setting Y coordinates by subtracting the pixel height of the string from height of the image calculated using imagesy().
$yCoords = imagesy($img) - $heightY; 
 
//setting the background-color of the string on image
$backgroundColor = imagecolorallocate ($img, 255, 255, 255);  

$txtColor = imagecolorallocate ($img, 0, 0,0); //setting the text-color of the string on image

// rendering the string on the image using X and Y coordinate values and other specific details
imagestring ($img, $fontSize, $xCoords, $yCoords, $txt, $txtColor);
 
//creating the final jpg image along with text and sending to the browser
imagejpeg($img);

?>

This code works for all JPEG image files.

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