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PHP图片上传类并生成缩略图

时间：2021-07-01 10:21:17 帮助过：30人阅读

  1. /**
  2. * 上传图片
  3. */
  4. class imgUpload{
  5. static protected $a;
  6. protected $formName; //表单名称
  7. protected $directory; //文件上传至目录
  8. protected $maxSize; //最大文件上传大小
  9. protected $canUpload; //是否可以上传
  10. protected $doUpFile; //上传的文件名
  11. protected $sm_File; //缩略图名称
  13. private function __construct($_formName='file', $_directory='./images/uploads/', $_maxSize=1048576){ //1024*1024=1M
  14. //初始化参数
  15. $this->formName = $_formName;
  16. $this->directory = $_directory;
  17. $this->maxSize = $_maxSize;
  18. $this->canUpload = true;
  19. $this->doUpFile = '';
  20. $this->sm_File = '';
  21. }
  23. //判断图片是否属于允许格式内
  24. static public function Type($_formName='file'){
  25. $_type = $_FILES[$_formName]['type'];
  26. switch ($_type){
  27. case 'image/gif':
  28. if (self::$a==NULL)
  29. self::$a = new imgUpload($_formName);
  30. break;
  31. case 'image/pjpeg':
  32. if (self::$a==NULL)
  33. self::$a = new imgUpload($_formName);
  34. break;
  35. case 'image/x-png':
  36. if (self::$a==NULL)
  37. self::$a = new imgUpload($_formName);
  38. break;
  39. default:
  40. self::$a = false;
  41. }
  42. return self::$a;
  43. }
  45. //获取文件大小
  46. public function getSize($_format='K'){
  47. if ($this->canUpload) {
  48. if (0 == $_FILES[$this->formName]['size']) {
  49. $this->canUpload = false;
  50. return $this->canUpload;
  51. break;
  52. }
  53. switch ($_format){
  54. case 'B':
  55. return $_FILES[$this->formName]['size'];
  56. break;
  57. case 'K':
  58. return round($_FILES[$this->formName]['size'] / 1024);
  59. break;
  60. case 'M':
  61. return round($_FILES[$this->formName]['size'] / (1024*1024),2);
  62. break;
  63. }
  64. }
  65. }
  67. //获取文件类型
  68. public function getExt(){
  69. if ($this->canUpload) {
  70. $_name = $_FILES[$this->formName]['name'];
  71. $_nameArr = explode('.',$_name);
  72. $_count = count($_nameArr)-1;
  73. }
  74. return $_nameArr[$_count];
  75. }
  77. //获取文件名称
  78. public function getName(){
  79. if ($this->canUpload) {
  80. return $_FILES[$this->formName]['name'];
  81. }
  82. }
  84. //新建文件名
  85. public function newName(){
  86. return date('YmdHis').rand(0,9);
  87. }
  89. //上传文件
  90. public function upload(){
  91. if ($this->canUpload)
  92. {
  93. $_getSize = $this->getSize('B');
  94. if (!$_getSize)
  95. {
  96. return $_getSize;
  97. break;
  98. }
  99. else
  100. {
  101. $_newName = $this->newName();
  102. $_ext = $this->getExt();
  103. $_doUpload = move_uploaded_file($_FILES[$this->formName]['tmp_name'], $this->directory.$_newName.".".$_ext);
  104. if ($_doUpload)
  105. {
  106. $this->doUpFile = $_newName;
  107. }
  108. return $_doUpload;
  109. }
  110. }
  111. }
  113. //创建缩略图
  114. public function thumb($_dstChar='_m', $_max_len=320){ //$_dstChar:_m , _s
  115. if ($this->canUpload && $this->doUpFile != "") {
  116. $_ext = $this->getExt();
  117. $_srcImage = $this->directory.$this->doUpFile.".".$_ext;
  119. //得到图片信息数组
  120. $_date = getimagesize($_srcImage, &$info);
  122. $src_w = $_date[0]; //源图片宽
  123. $src_h = $_date[1]; //源图片高
  124. $src_max_len = max($src_w, $src_h); //求得长边
  125. $src_min_len = min($src_w, $src_h); //求得短边
  126. $dst_w = ''; //目标图片宽
  127. $dst_h = ''; //目标图片高
  129. //宽高按比例缩放，最长边不大于$_max_len
  130. if ($src_max_len>$_max_len)
  131. {
  132. $percent = $src_min_len / $src_max_len;
  133. if ($src_w == $src_max_len)
  134. {
  135. $dst_w = $_max_len;
  136. $dst_h = $percent * $dst_w;
  137. }
  138. else
  139. {
  140. $dst_h = $_max_len;
  141. $dst_w = $percent * $dst_h;
  142. }
  143. }
  144. else
  145. {
  146. $dst_w = $src_w;
  147. $dst_h = $src_h;
  148. }
  150. //建立缩略图时,源图片的位置
  151. $src_x = '';
  152. $src_y = '';
  154. //判断如果缩略图用于logo，将对其进行裁减
  155. if ('s_' == $_dstChar) {
  156. $src_x = $src_w * 0.10;
  157. $src_y = $src_h * 0.10;
  158. $src_w *= 0.8;
  159. $src_h *= 0.8;
  160. }
  162. //判断图片类型并创建对应新图片
  163. switch ($_date[2]){
  164. case 1:
  165. $src_im = imagecreatefromgif($_srcImage);
  166. break;
  167. case 2:
  168. $src_im = imagecreatefromjpeg($_srcImage);
  169. break;
  170. case 3:
  171. $src_im = imagecreatefrompng($_srcImage);
  172. break;
  173. case 8:
  174. $src_im = imagecreatefromwbmp($_srcImage);
  175. break;
  176. }
  178. //创建一幅新图像
  179. if ($_date[2]==1) { //gif无法应用imagecreatetruecolor
  180. $dst_im = imagecreate($dst_w, $dst_h);
  181. }else {
  182. $dst_im = imagecreatetruecolor($dst_w, $dst_h);
  183. }
  185. //对这副图像进行缩略图copy
  186. // $bg = imagecolorallocate($dst_im,255,255,0);
  187. imagecopyresized($dst_im,$src_im, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $src_w, $src_h );
  188. //对图片进行抗锯齿操作
  189. imageantialias($dst_im, true);
  191. switch ($_date[2]) {
  192. case 1:
  193. $cr = imagegif($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
  194. break;
  195. case 2:
  196. $cr = imagejpeg($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
  197. break;
  198. case 3://imagepng有问题，所以在这里用imagejpg代替
  199. $cr = imagejpeg($dst_im, $this->directory.$this->doUpFile.$_dstChar.".".$_ext, 100);
  200. break;
  201. }
  202. // $cr = imagejpeg($dst_im, $this->directory.$_dstChar.$this->doUpFile, 90);
  203. if ($cr) {
  204. $this->sm_File = $this->directory.$this->doUpFile.$_dstChar.".".$_ext;
  206. return $this->sm_File;
  207. }else {
  208. return false;
  209. }
  210. }
  211. imagedestroy($dst_im);
  212. imagedestroy($cr);
  213. }
  215. //得到上传后的文件名
  216. public function getUpFile(){
  217. if ($this->doUpFile!='') {
  218. $_ext = $this->getExt();
  219. return $this->doUpFile.".".$_ext;
  220. }else {
  221. return false;
  222. }
  223. }
  225. //得到上传后的文件全路径
  226. public function getFilePatch(){
  227. if ($this->doUpFile!='') {
  228. $_ext = $this->getExt();
  229. return $this->directory.$this->doUpFile.".".$_ext;
  230. }else {
  231. return false;
  232. }
  233. }
  235. //得到缩略图文件全路径
  236. public function getThumb(){
  237. if ($this->sm_File!='') {
  238. return $this->sm_File;
  239. }else {
  240. return false;
  241. }
  242. }
  243. //得到上传文件的路径
  244. public function getDirectory(){
  245. if ($this->directory!='') {
  246. return $this->directory;
  247. }else {
  248. return false;
  249. }
  250. }
  251. }
  252. ?>

图片上传, PHP

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