如何使用PHP GD库向图像添加文本

I have image creation code in image_creator.

我有image_creator中的图像创建代码。

<?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

图像输出的文件是图像。php和下面的代码

<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?

当我运行的形象。php，我得到一个空白页。为什么如此?

3 个解决方案

#1

Use this to add text to image (copied from PHP for Kids)

使用它向图像添加文本(从PHP为儿童复制)

<?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);
    ?>

#2

Problem here is, $black = ImageColorAllocate($im, 255, 255, 255); //<== this not black, its white //for black it should be like,

这里的问题是，$black = imagecolor分配($im, 255, 255, 255);//<=这个不是黑色的，它是白色的//对于黑色它应该是这样的，

$black = ImageColorAllocate($im, 0, 0, 0);

#3

Problem here is

问题是

$black = ImageColorAllocate($im, 255, 255, 255);

this not black, its white. For black it should be like,

这不是黑色，而是白色。对于黑色，它应该是，

$black = ImageColorAllocate($im, 0, 0, 0);

#1