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+<?php
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+// +----------------------------------------------------------------------
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+// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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+// +----------------------------------------------------------------------
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+// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
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+// +----------------------------------------------------------------------
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+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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+// +----------------------------------------------------------------------
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+// | Author: liu21st <liu21st@gmail.com>
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+// +----------------------------------------------------------------------
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+
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+namespace think;
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+/**
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+ 图片压缩操作类
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+ v1.0
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+*/
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+class Compression
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+{
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+ private $src;
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+ public $percent = 0.1;
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+ public function __construct($src){
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+
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+ $this->src = $src;
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+
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+ }
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+ /**
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+ * 图片压缩处理
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+ * @param string $sFile 图片路径
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+ * @param int $iWidth 自定义图片宽度
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+ * @param int $iHeight 自定义图片高度
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+ */
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+ function getThumb(){
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+ $iWidth = 375;
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+ $iHeight = 240;
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+ $sFile = $this->src;
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+ //判断该图片是否存在
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+ if(!file_exists($sFile)) return $sFile;
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+ //判断图片格式
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+ $attach_fileext = $this->get_filetype($sFile);
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+ if (!in_array($attach_fileext, array('jpg','png','jpeg'))){
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+ return $sFile;
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+ }
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+ //压缩图片
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+ $sFileNameS = str_replace(".".$attach_fileext, "_".$iWidth.'_'.$iHeight.'.'.$attach_fileext, $sFile);
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+ //判断是否已压缩图片，若是则返回压缩图片路径
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+ if(file_exists($sFileNameS)){
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+ return $sFileNameS;
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+ }
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+ //解决手机端上传图片被旋转问题
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+ /*if (in_array($attach_fileext, array('jpeg')) ){
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+ $this->adjustPicOrientation($sFile);
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+ }*/
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+ //生成压缩图片，并存储到原图同路径下
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+ $this->resizeImage($sFile, $sFileNameS, $iWidth, $iHeight);
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+ if(!file_exists($sFileNameS)){
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+ return $sFile;
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+ }
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+ return $sFileNameS;
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+ }
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+ /**
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+ *获取文件后缀名
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+ */
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+ function get_filetype($filename) {
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+ $extend = explode("." , $filename);
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+ return strtolower($extend[count($extend) - 1]);
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+ }
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+ /**
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+ * 生成图片
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+ * @param string $im 源图片路径
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+ * @param string $dest 目标图片路径
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+ * @param int $maxwidth 生成图片宽
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+ * @param int $maxheight 生成图片高
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+ */
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+ function resizeImage($im, $dest, $maxwidth, $maxheight) {
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+ $img = getimagesize($im);
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+ switch ($img[2]) {
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+ case 1:
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+ $im = @imagecreatefromgif($im);
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+ break;
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+ case 2:
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+ $im = @imagecreatefromjpeg($im);
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+ break;
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+ case 3:
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+ $im = @imagecreatefrompng($im);
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+ break;
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+ }
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+
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+ $pic_width = imagesx($im);
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+ $pic_height = imagesy($im);
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+ $resizewidth_tag = false;
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+ $resizeheight_tag = false;
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+ if (($maxwidth && $pic_width > $maxwidth) || ($maxheight && $pic_height > $maxheight)) {
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+ if ($maxwidth && $pic_width > $maxwidth) {
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+ $widthratio = $maxwidth / $pic_width;
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+ $resizewidth_tag = true;
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+ }
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+
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+ if ($maxheight && $pic_height > $maxheight) {
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+ $heightratio = $maxheight / $pic_height;
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+ $resizeheight_tag = true;
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+ }
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+
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+ if ($resizewidth_tag && $resizeheight_tag) {
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+ if ($widthratio < $heightratio)
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+ $ratio = $widthratio;
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+ else
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+ $ratio = $heightratio;
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+ }
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+
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+
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+ if ($resizewidth_tag && !$resizeheight_tag)
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+ $ratio = $widthratio;
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+ if ($resizeheight_tag && !$resizewidth_tag)
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+ $ratio = $heightratio;
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+ $newwidth = $pic_width * $ratio;
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+ $newheight = $pic_height * $ratio;
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+
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+ if (function_exists("imagecopyresampled")) {
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+ $newim = imagecreatetruecolor($newwidth, $newheight);
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+ imagecopyresampled($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $pic_width, $pic_height);
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+ } else {
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+ $newim = imagecreate($newwidth, $newheight);
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+ imagecopyresized($newim, $im, 0, 0, 0, 0, $newwidth, $newheight, $pic_width, $pic_height);
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+ }
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+
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+ imagejpeg($newim, $dest);
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+ imagedestroy($newim);
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+ } else {
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+ imagejpeg($im, $dest);
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+ }
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+ }
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+ /**
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+ * 解决手机上传图片被旋转问题
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+ * @param string $full_filename 文件路径
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+ */
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+ function adjustPicOrientation($full_filename){
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+ $exif = exif_read_data($full_filename);
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+ if($exif && isset($exif['Orientation'])) {
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+ $orientation = $exif['Orientation'];
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+ if($orientation != 1){
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+ $img = imagecreatefromjpeg($full_filename);
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+
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+ $mirror = false;
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+ $deg = 0;
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+
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+ switch ($orientation) {
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+ case 2:
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+ $mirror = true;
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+ break;
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+ case 3:
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+ $deg = 180;
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+ break;
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+ case 4:
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+ $deg = 180;
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+ $mirror = true;
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+ break;
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+ case 5:
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+ $deg = 270;
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+ $mirror = true;
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+ break;
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+ case 6:
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+ $deg = 270;
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+ break;
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+ case 7:
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+ $deg = 90;
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+ $mirror = true;
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+ break;
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+ case 8:
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+ $deg = 90;
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+ break;
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+ }
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+ if ($deg) $img = imagerotate($img, $deg, 0);
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+ if ($mirror) $img = _mirrorImage($img);
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+ //$full_filename = str_replace('.jpg', "-O$orientation.jpg", $full_filename);新文件名
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+ imagejpeg($img, $full_filename, 95);
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+ }
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+ }
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+ return $full_filename;
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+ }
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+} |
