Discussion on the method of realizing Chinese watermark in PHP GD library _php Tutorial

When we upload images on the site, many of them have the need to add watermarks to the images. Let's give you a detailed explanation

PHP GD Library Implementation of the relevant code examples of Chinese watermark:

2. < ? PHP
4. $ im = Imagecreatetruecolor (100,100);
6. Create a new True color image
8. $ White = imagecolorallocate ($im, 255,235,255);
10. assigning colors to an image is different from my design knowledge.
    I never thought that when painting, I want to assign a color to the specified image ID first
    .. This function is often confused with the Imagefill function.
12. Imagefill ($im, 0,0, $white);
14. Area fill
16. $ Black = imagecolorallocate ($im, 250,50,50);
18. Assign a color to an image
20. Imagerectangle ($im, 5,5,50,50, $black);
22. Draw a rectangle
24. Header ("Content-type:image/jpeg");
26. Sends the header, with imagejpeg to output the image directly in the browser.
28. Imagejpeg ($im, ' ImageName ', 100);
30. Output a image, naming and quality
32. Imagedestroy ($im);
34. Releases the memory associated with the image. Image
    Is the image identifier returned by the image creation function
36. ?>

PHP GD Library Implementation of Chinese watermark code

 
 

  
  

  
< ? PHP
  
  

  
Header ("Content-type:image/png");
  
  

  
/* Notify browser, to output image */
  
  

  
$ im  =  imagecreate (400, 300); 
  
  

  
/* Define the size of the image */
  
  

  
$ Gray  =  imagecolorallocate ($im, 235, 235, 235); 
  
  

  
$ Pink  =  imagecolorallocate ($im, 255, 128, 255); 
  
  

  
/*
  
  

  
$ Fontfile  =  "C:windowsfontssimhei.ttf" ; 
  
  

  
Sorry, this sentence is always adhered to after the submission was lost, do not know what is going on
, the friends who want to test will comment on the test now
  
  

  
*/
  
  

  
/* $fontfile the path to the font, depending on the operating system, can be
Simhei.ttf (blackbody), Simkai. TTF (in italics),
Simfang. TTF (imitation), SimSun. TTC (Arial & neo-Arial)
GD-Supported Chinese fonts */
  
  

  
$ Str  =  Iconv (' GB2312 ', ' UTF-8 ', ' Chinese watermark!!! '); 
  
  

  
/* Convert the gb2312 character set to UTF-8 characters */
  
  

  
Imagettftext ($im, 30, 0, 50, 140,
$pink, $fontfile, $STR);
  
  

  
/* Add Chinese watermark */
  
  

  
Imagepng ($im);
  
  

  
Imagedestroy ($im);
  
  

  
?>  
 
 

The above is the PHP GD library to achieve the Chinese watermark of the relevant methods summary.

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