php图片上传旋转压缩方法
用到php的exif扩展，需要开启exif
在php.ini文件中去掉exif组件的注释
extension=php_mbstring.dll //要放在php_exif.dll前面让它先加载
extension=php_exif.dll
[exif]
exif.encode_unicode = ISO-8859-15
exif.decode_unicode_motorola = UCS-2BE
exif.decode_unicode_intel = UCS-2LE
exif.encode_jis =
exif.decode_jis_motorola = JIS
exif.decode_jis_intel = JIS
1 /**
2 * Modified Version of cameraUsed, no longer returns date.
3 */
4 private function cameraUsed($imagePath)
5 {
6 // The default empty return
7 $return = array(
8 'make' => "",
9 'model' => "",
10 'exposure' => "",
11 'aperture' => "",
12 'iso' => "",
13 'Orientation' => 1,
14 );
15
16 // Check if the variable is set and if the file itself exists before continuing
17 if ((isset($imagePath)) && (file_exists($imagePath)))
18 {
19 // There are 2 arrays which contains the information we are after, so it's easier to state them both
20 $exif_ifd0 = @read_exif_data($imagePath ,'IFD0' ,0);
21 $exif_exif = @read_exif_data($imagePath ,'EXIF' ,0);
22
23 // Ensure that we actually got some information
24 if (($exif_ifd0 !== false) && ($exif_exif !== false))
25 {
26 // Make
27 if (@array_key_exists('Make', $exif_ifd0))
28 {
29 $return['make'] = $exif_ifd0['Make'];
30 }
31
32 // Model
33 if (@array_key_exists('Model', $exif_ifd0))
34 {
35 $return['model'] = $exif_ifd0['Model'];
36 }
37
38 // Exposure
39 if (@array_key_exists('ExposureTime', $exif_ifd0))
40 {
41 $return['exposure'] = $exif_ifd0['ExposureTime'];
42 }
43
44 // Aperture
45 if (@array_key_exists('ApertureFNumber', $exif_ifd0['COMPUTED']))
46 {
47 $return['aperture'] = $exif_ifd0['COMPUTED']['ApertureFNumber'];
48 }
49
50 // ISO
51 if (@array_key_exists('ISOSpeedRatings',$exif_exif))
52 {
53 $return['iso'] = $exif_exif['ISOSpeedRatings'];
54 }
55 if(@array_key_exists('Orientation',$exif_ifd0)){
56 $return['Orientation'] = $exif_ifd0['Orientation'];
57 }
58 }
59 }
60
61 // Return either an empty array, or the details which we were able to extrapolate.
62 return $return;
63 }
64
65 /**
66 * resize image and don't rotates images have exif info
67 * @param $pic eg：$_FILES['file']['tmp_name']
68 * @param $thumb image save path
69 * @param $thumbwidth
70 * @param int $quality
71 */
72 private function createThumbnail($pic,$thumb,$thumbwidth, $quality = 100)
73 {
74
75 $im1 = @imagecreatefromjpeg($pic);
76
77 $exif = $this->cameraUsed($pic);
78 if(($exif['Orientation'] > 1)) {
79 switch($exif['Orientation']) {
80 case 8:
81 $im1 = @imagerotate($im1,90,0);
82 break;
83 case 3:
84 $im1 = @imagerotate($im1,180,0);
85 break;
86 case 6:
87 $im1 = @imagerotate($im1,-90,0);
88 break;
89 }
90 }
91
92 $info = @getimagesize($pic);
93
94 $width = $info[0];
95
96 $w2 = @imagesx($im1);
97 $h2 = @imagesy($im1);
98 $w1 = ($thumbwidth <= $width) ? $thumbwidth : $width;
99
100
101 $h1 = @floor($h2 * ($w1 / $w2));
102
103 $im2 = @imagecreatetruecolor($w1,$h1);
104
105 @imagecopyresampled ($im2,$im1,0,0,0,0,$w1,$h1,$w2,$h2);
106 $path = addslashes($thumb);
107 @imagejpeg($im2,$path,$quality);
108 @imagedestroy($im1);
109 @imagedestroy($im2);
110 }
