텍스트를 이미지로 만들기

1. <?php
2. /*
3.     Dynamic Heading Generator
4.     By Stewart Rosenberger
5.     http://www.stewartspeak.com/headings/    
7.     This script generates PNG images of text, written in
8.     the font/size that you specify. These PNG images are passed
9.     back to the browser. Optionally, they can be cached for later use.
10.     If a cached image is found, a new image will not be generated,
11.     and the existing copy will be sent to the browser.
13.     Additional documentation on PHP's image handling capabilities can
14.     be found at http://www.php.net/image/    
15. */
17. $font_file = 'fontname.ttf';
18. $font_size = 50 ; // font size in pts
19. $font_color = '#000000' ;
20. $background_color = '#ffffff' ;
21. $transparent_background = true ;
23. /*
24. --------------------------------------------------------------
25. Optionally, images can be cached for later use.
26. If a cached image is found, a new image will not be generated,
27. and the existing copy will be sent to the browser. However,
28. that won't happen unless a WRITABLE "cache" directory is there
29. for the images to be stored.
30. --------------------------------------------------------------
31. */
33. $cache_images = true ;
34. $cache_folder = 'cache' ;
36. /*
37. -----------------
38. Added for P+C DTR
39. -----------------
40. */
41. session_start();
43. $text_info = $_SESSION['pcdtr'][$_GET['tag']];
45. if ($text_info['font-size']) {
46.     $font_size = $text_info['font-size'];
47. }
49. if ($text_info['background-color']) {
50.     $background_color = $text_info['background-color'];
51. }
53. if ($text_info['color']) {
54.     $font_color = $text_info['color'];
55. }
56. /*
57. -----------------------
58. End of P+C DTR Addition
59. -----------------------
60. */
62. /*
63. ---------------------------------------------------------------------------
64. For basic usage, you should not need to edit anything below this comment.
65. If you need to further customize this script's abilities, make sure you
66. are familiar with PHP and its image handling capabilities.
67. ---------------------------------------------------------------------------
68. */
70. $mime_type = 'image/png' ;
71. $extension = '.png' ;
72. $send_buffer_size = 4096 ;
74. // check for GD support
75. if(!function_exists('ImageCreate'))
76.     fatal_error('Error: Server does not support PHP image generation') ;
78. // clean up text
79. if(empty($_GET['text']))
80.     fatal_error('Error: No text specified.') ;
81.     
82. $text = html_entity_decode($_GET['text']).' ' ;
83. if(get_magic_quotes_gpc())
84.     $text = stripslashes($text) ;
85. $text = javascript_to_html($text) ;
87. // look for cached copy, send if it exists
88. $hash = md5(basename($font_file) . $font_size . $font_color .
89.             $background_color . $transparent_background . $text) ;
90. $cache_filename = $cache_folder . '/' . $hash . $extension ;
91. if($cache_images && ($file = @fopen($cache_filename,'rb')))
92. {
93.     header('Content-type: ' . $mime_type) ;
94.     while(!feof($file))
95.         print(($buffer = fread($file,$send_buffer_size))) ;
96.     fclose($file) ;
97.     exit ;
98. }
100. // check font availability
101. $font_found = is_readable($font_file) ;
102. if(!$font_found)
103. {
104.     fatal_error('Error: The server is missing the specified font.') ;
105. }
107. // create image
108. $background_rgb = hex_to_rgb($background_color) ;
109. $font_rgb = hex_to_rgb($font_color) ;
110. $dip = get_dip($font_file,$font_size) ;
111. $box = @ImageTTFBBox($font_size,0,$font_file,$text) ;
112. $image = @ImageCreate(abs($box[2]-$box[0]),abs($box[5]-$dip)) ;
113. if(!$image || !$box)
114. {
115.     fatal_error('Error: The server could not create this heading image.') ;
116. }
118. // allocate colors and draw text
119. $background_color = @ImageColorAllocate($image,$background_rgb['red'],
120.     $background_rgb['green'],$background_rgb['blue']) ;
121. $font_color = ImageColorAllocate($image,$font_rgb['red'],
122.     $font_rgb['green'],$font_rgb['blue']) ;
123. ImageTTFText($image,$font_size,0,-$box[0],abs($box[5]-$box[3])-$box[1],
124.     $font_color,$font_file,$text) ;
126. // set transparency
127. if($transparent_background)
128.     ImageColorTransparent($image,$background_color) ;
130. header('Content-type: ' . $mime_type) ;
131. ImagePNG($image) ;
133. // save copy of image for cache
134. if($cache_images)
135. {
136.     @ImagePNG($image,$cache_filename) ;
137. }
139. ImageDestroy($image) ;
140. exit ;
143. /*
144.     try to determine the "dip" (pixels dropped below baseline) of this
145.     font for this size.
146. */
147. function get_dip($font,$size)
148. {
149.     $test_chars = 'abcdefghijklmnopqrstuvwxyz' .
150.                  'ABCDEFGHIJKLMNOPQRSTUVWXYZ' .
151.                  '1234567890' .
152.                  '!@#$%^&*()\'"\\/;.,`~<>[]{}-+_-=' ;
153.     $box = @ImageTTFBBox($size,0,$font,$test_chars) ;
154.     return $box[3] ;
155. }
158. /*
159.     attempt to create an image containing the error message given.
160.     if this works, the image is sent to the browser. if not, an error
161.     is logged, and passed back to the browser as a 500 code instead.
162. */
163. function fatal_error($message)
164. {
165.     // send an image
166.     if(function_exists('ImageCreate'))
167.     {
168.         $width = ImageFontWidth(5) * strlen($message) + 10 ;
169.         $height = ImageFontHeight(5) + 10 ;
170.         if($image = ImageCreate($width,$height))
171.         {
172.             $background = ImageColorAllocate($image,255,255,255) ;
173.             $text_color = ImageColorAllocate($image,0,0,0) ;
174.             ImageString($image,5,5,5,$message,$text_color) ;    
175.             header('Content-type: image/png') ;
176.             ImagePNG($image) ;
177.             ImageDestroy($image) ;
178.             exit ;
179.         }
180.     }
182.     // send 500 code
183.     header("HTTP/1.0 500 Internal Server Error") ;
184.     print($message) ;
185.     exit ;
186. }
189. /*
190.     decode an HTML hex-code into an array of R,G, and B values.
191.     accepts these formats: (case insensitive) #ffffff, ffffff, #fff, fff
192. */    
193. function hex_to_rgb($hex)
194. {
195.     // remove '#'
196.     if(substr($hex,0,1) == '#')
197.         $hex = substr($hex,1) ;
199.     // expand short form ('fff') color
200.     if(strlen($hex) == 3)
201.     {
202.         $hex = substr($hex,0,1) . substr($hex,0,1) .
203.              substr($hex,1,1) . substr($hex,1,1) .
204.              substr($hex,2,1) . substr($hex,2,1) ;
205.     }
207.     if(strlen($hex) != 6)
208.         fatal_error('Error: Invalid color "'.$hex.'"') ;
210.     // convert
211.     $rgb['red'] = hexdec(substr($hex,0,2)) ;
212.     $rgb['green'] = hexdec(substr($hex,2,2)) ;
213.     $rgb['blue'] = hexdec(substr($hex,4,2)) ;
215.     return $rgb ;
216. }
219. /*
220.     convert embedded, javascript unicode characters into embedded HTML
221.     entities. (e.g. '%u2018' => '&#8216;'). returns the converted string.
222. */
223. function javascript_to_html($text)
224. {
225.     $matches = null ;
226.     preg_match_all('/%u([0-9A-F]{4})/i',$text,$matches) ;
227.     if(!empty($matches)) for($i=0;$i<sizeof($matches[0]);$i++)
228.         $text = str_replace($matches[0][$i],
229.                             '&#'.hexdec($matches[1][$i]).';',$text) ;
231.     return $text ;
232. }
234. ?>