unable to show text on the image - php

Question

I want to show some text on an image. I am using the following code :
session_start();
$name = $_SESSION['name'];
$nameLength = strlen($name); // gets the length of the name
$randomNumber = rand(0, $nameLength - 1); // generates a random number no longer than the name length
$string = ucfirst(substr($name, $randomNumber, 1)); // gets the substring of one letter based on that random number
$im = imagecreatefromjpeg("love.jpg");
$text = " First Letter of Your partner's name is";
$font = "Font.ttf";
$black = imagecolorallocate($im, 0, 0, 0);
$black1 = imagecolorallocate($im, 255, 0, 0);
imagettftext($im, 32, 0, 380, 430, $black, $font, $text);
imagettftext($im, 52, 0, 630, 530, $black1, $font, $string);
imagejpeg($im, null, 90);
but on localhost this code is showing the text on the image but when I am uploading it to server then it is showing only image, text is not shown on this image ? what may be the problem?
$_SESSION['name'] is value when I login to facebook and save the name of the user into $_SESSION
I have uploaded the above code on the server :
http://rohitashvsinghal.com/fb/login.php

Answer 1

The font must exist in the location specified obviously and the fullpath to the font works best in my experience.
<?php
session_start();
$name = $_SESSION['name'];
$nameLength = strlen($name);
$randomNumber = rand(0, $nameLength - 1);
$string = ucfirst(substr($name, $randomNumber, 1));
$im = imagecreatefromjpeg("love.jpg");
$text = " First Letter of Your partner's name is";
/* Either use the fullpath or the method given below from the manual */
$fontpath=$_SERVER['DOCUMENT_ROOT'].'/path/to/fonts/';
putenv('GDFONTPATH='.realpath( $fontpath ) );
$fontname='arial.ttf';
$font = realpath( $fontpath . DIRECTORY_SEPARATOR . $fontname );
$black = imagecolorallocate($im, 0, 0, 0);
$black1 = imagecolorallocate($im, 255, 0, 0);
imagettftext($im, 32, 0, 380, 430, $black, $font, $text);
imagettftext($im, 52, 0, 630, 530, $black1, $font, $string);
imagejpeg($im, null, 90);
?>
However, the manual states:-
Depending on which version of the GD library PHP is using, when
fontfile does not begin with a leading / then .ttf will be appended to
the filename and the library will attempt to search for that filename
along a library-defined font path.
In many cases where a font resides in the same directory as the script
using it the following trick will alleviate any include problems.
<?php
// Set the enviroment variable for GD
putenv('GDFONTPATH=' . realpath('.'));
// Name the font to be used (note the lack of the .ttf extension)
$font = 'SomeFont';
?>