How to add text to an image with PHP GD library
Question
I have image creation code in image_creator.
<?php
header("Content-Type: image/jpeg");
$im = ImageCreateFromGif("photo.gif");
$black = ImageColorAllocate($im, 255, 255, 255);
$start_x = 10;
$start_y = 20;
Imagettftext($im, 12, 0, $start_x, $start_y, $black, 'verdana.ttf', "text to write");
Imagejpeg($im, '', 100);
ImageDestroy($im);
?>
The file for image output is image.php and has below code
<html>
<head>
</head>
<body>
<img src="http://localhost/image_creator.php"/>
</body>
</html>
When I run image.php, I just get a blank page. Why is it so?
4 answers
solution1
56 ACCPTED 2012-11-07 11:04:02
Use this to add text to image (copied from PHP for Kids )
<?php
//Set the Content Type
header('Content-type: image/jpeg');
// Create Image From Existing File
$jpg_image = imagecreatefromjpeg('sunset.jpg');
// Allocate A Color For The Text
$white = imagecolorallocate($jpg_image, 255, 255, 255);
// Set Path to Font File
$font_path = 'font.TTF';
// Set Text to Be Printed On Image
$text = "This is a sunset!";
// Print Text On Image
imagettftext($jpg_image, 25, 0, 75, 300, $white, $font_path, $text);
// Send Image to Browser
imagejpeg($jpg_image);
// Clear Memory
imagedestroy($jpg_image);
?>
solution2
5 2013-12-11 11:45:08
Problem here is, $black = ImageColorAllocate($im, 255, 255, 255); //<== this not black, its white //for black it should be like,
$black = ImageColorAllocate($im, 0, 0, 0);
solution3
2 2014-02-21 06:18:57
Problem here is
$black = ImageColorAllocate($im, 255, 255, 255);
this not black, its white. For black it should be like,
$black = ImageColorAllocate($im, 0, 0, 0);
solution4
0 2022-06-09 18:33:04
$img = imagecreatefromjpeg("certificate.jpg");//replace with your image
$txt = 'NILESH';//your text
$fontFile = realpath("arial.ttf");//replace with your font
$fontSize = 24;
$fontColor = imagecolorallocate($img, 255, 255, 255);
$black = imagecolorallocate($img, 0, 0, 0);
$angle = 0;
$iWidth = imagesx($img);
$iHeight = imagesy($img);
$tSize = imagettfbbox($fontSize, $angle, $fontFile, $txt);
$tWidth = max([$tSize[2], $tSize[4]]) - min([$tSize[0], $tSize[6]]);
$tHeight = max([$tSize[5], $tSize[7]]) - min([$tSize[1], $tSize[3]]);
// text is placed in center you can change it by changing $centerX, $centerY values
$centerX = CEIL(($iWidth - $tWidth) / 2);
$centerX = $centerX<0 ? 0 : $centerX;
$centerY = CEIL(($iHeight - $tHeight) / 2);
$centerY = $centerY<0 ? 0 : $centerY;
imagettftext($img, $fontSize, $angle, $centerX, $centerY, $black, $fontFile, $txt);
imagejpeg($img,'my-certificate.jpg");//save image
imagedestroy($img);
solution5
0 2022-11-30 12:12:44
If you do not have a font file at hand, you could still simply use imagecreate :
// simple image to display URL (cut off)
$im = imagecreate(255, 170);
// white background and blue text
$bg = imagecolorallocate($im, 255, 255, 255);
$textcolor = imagecolorallocate($im, 0, 0, 255);
// write the string at the top left
imagestring($im, 5, 0, 0, $url, $textcolor);
// Output the image
header('Content-type: image/png');
ob_start();
imagepng($im);
$image_bin = ob_get_contents();
ob_end_clean();
imagedestroy($im);
echo $image_bin;
exit();
However, it cuts off the text if too long.
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