php Hex RGB颜色值互换的例子

3. /**

4. * Hex RGB颜色值互换
5. * Edit bbs.it-home.org
6. * at 2013/5/11
7. */
8. function HexToRGB($colour) {
9. if ($colour [0] == '#') {
10. $colour = substr ( $colour, 1 );
11. }
12. if (strlen ( $colour ) == 6) {
13. list ( $r, $g, $b ) = array (
14. $colour [0] . $colour [1],
15. $colour [2] . $colour [3],
16. $colour [4] . $colour [5]
17. );
18. } elseif (strlen ( $colour ) == 3) {
19. list ( $r, $g, $b ) = array (
20. $colour [0] . $colour [0],
21. $colour [1] . $colour [1],
22. $colour [2] . $colour [2]
23. );
24. } else {
25. return false;
26. }
27. $r = hexdec ( $r );
28. $g = hexdec ( $g );
29. $b = hexdec ( $b );
30. return array (
31. 'red' => $r,
32. 'green' => $g,
33. 'blue' => $b
34. );
35. }
36. function RGBToHex($rgb) {
37. $regexp = "/^rgb\(([0-9]{0,3})\,\s*([0-9]{0,3})\,\s*([0-9]{0,3})\)/";
38. $re = preg_match ( $regexp, $rgb, $match );
39. $re = array_shift ( $match );
40. $hexColor = "#";
41. $hex = array (
42. '0',
43. '1',
44. '2',
45. '3',
46. '4',
47. '5',
48. '6',
49. '7',
50. '8',
51. '9',
52. 'A',
53. 'B',
54. 'C',
55. 'D',
56. 'E',
57. 'F'
58. );
59. for($i = 0; $i $r = null;
60. $c = $match [$i];
61. $hexAr = array ();

62. while ( $c > 16 ) {

63. $r = $c % 16;
64. $c = ($c / 16) >> 0;
65. array_push ( $hexAr, $hex [$r] );
66. }
67. array_push ( $hexAr, $hex [$c] );

68. $ret = array_reverse ( $hexAr );

69. $item = implode ( '', $ret );
70. $item = str_pad ( $item, 2, '0', STR_PAD_LEFT );
71. $hexColor .= $item;
72. }
73. return $hexColor;
74. }

75. //调用示例

76. echo implode ( ",", HexToRGB ( "#F7F7DA" ) ) . "
    ";
77. echo RGBToHex ( "rgb(247,247,218)" )；
78. ?>

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