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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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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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$this->src = $src;
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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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$pic_width = imagesx($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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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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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 = $heightratio;
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}
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if ($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 * $ratio;
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if (function_exists("imagecopyresampled")) {
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$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, $pic_height);
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}
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imagejpeg($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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$mirror = false;
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$deg = 0;
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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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} |
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\ No newline at end of file |
...
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