thinkphp5 上传图片压缩
1、Compress.php（该文件放在vendor文件夹中）
1 <?php 2 class Compress 3 { 4 private $src; 5 private $image; 6 private $imageinfo; 7 private $percent=0.5; 8 9 /* 10 param $src源图 11 param $percent压缩比例 12 */ 13 public function __construct($src,$percent=1) 14 { 15 $this->src = $src; 16 $this->percent = $percent; 17 } 18 19 20 21 /* 22 param string $saveName 图片名（可不带扩展名用原图名）用于保存。或不提供文件名直接显示 23 */ 24 public function compressImg($saveName='') 25 { 26 $this->_openImage(); 27 if(!empty($saveName)) 28 { 29 $this->_saveImage($saveName);//保存 30 } 31 else 32 { 33 $this->_showImage(); 34 } 35 } 36 37 38 39 40 /* 41 内部：打开图片 42 */ 43 private function _openImage() 44 { 45 list($width, $height, $type, $attr) = getimagesize($this->src); 46 $this->imageinfo = array( 47 'width'=>$width, 48 'height'=>$height, 49 'type'=>image_type_to_extension($type,false), 50 'attr'=>$attr 51 ); 52 $fun = "imagecreatefrom".$this->imageinfo['type']; 53 $this->image = $fun($this->src); 54 $this->_thumpImage(); 55 } 56 57 58 59 60 61 /** 62 * 内部：操作图片 63 */ 64 private function _thumpImage() 65 { 66 $new_width = $this->imageinfo['width'] * $this->percent; 67 $new_height = $this->imageinfo['height'] * $this->percent; 68 $image_thump = imagecreatetruecolor($new_width,$new_height); 69 //将原图复制带图片载体上面，并且按照一定比例压缩,极大的保持了清晰度 70 71 /* 处理缩放png图透明背景变黑色问题 start */ 72 $color=imagecolorallocate($image_thump,255,255,255); 73 imagecolortransparent($image_thump,$color); 74 imagefill($image_thump,0,0,$color); 75 /* 处理缩放png图透明背景变黑色问题 end */ 76 77 imagecopyresampled($image_thump,$this->image,0,0,0,0,$new_width,$new_height,$this->imageinfo['width'],$this->imageinfo['height']); 78 imagedestroy($this->image); 79 $this->image = $image_thump; 80 } 81 82 83 84 85 86 /** 87 * 输出图片:保存图片则用saveImage() 88 */ 89 private function _showImage() 90 { 91 header('Content-Type: image/'.$this->imageinfo['type']); 92 $funcs = "image".$this->imageinfo['type']; 93 $funcs($this->image); 94 } 95 96 97 98 99 100 /** 101 * 保存图片到硬盘： 102 * @param string $dstImgName 1、可指定字符串不带后缀的名称，使用源图扩展名 。2、直接指定目标图片名带扩展名。 103 */ 104 private function _saveImage($dstImgName) 105 { 106 if(empty($dstImgName)) return false; 107 $allowImgs = ['.jpg', '.jpeg', '.png', '.bmp', '.wbmp','.gif']; //如果目标图片名有后缀就用目标图片扩展名 后缀，如果没有，则用源图的扩展名 108 $dstExt = strrchr($dstImgName ,"."); 109 $sourseExt = strrchr($this->src ,"."); 110 if(!empty($dstExt)) $dstExt =strtolower($dstExt); 111 if(!empty($sourseExt)) $sourseExt =strtolower($sourseExt); 112 113 //有指定目标名扩展名 114 if(!empty($dstExt) && in_array($dstExt,$allowImgs)) 115 { 116 $dstName = $dstImgName; 117 } 118 elseif(!empty($sourseExt) && in_array($sourseExt,$allowImgs)) 119 { 120 $dstName = $dstImgName.$sourseExt; 121 } 122 else 123 { 124 $dstName = $dstImgName.$this->imageinfo['type']; 125 } 126 $funcs = "image".$this->imageinfo['type']; 127 $funcs($this->image,$dstName); 128 } 129 130 131 132 133 134 /** 135 * 销毁图片 136 */ 137 public function __destruct() 138 { 139 imagedestroy($this->image); 140 } 141 }
2、common.php 文件
1 <?php 2 // 应用公共文件 3 4 function ajaxUploader(){ 5 $file = request()->file('file'); 6 7 $info = $file->validate(['size'=>20971520,'ext'=>'jpg,png,gif,jpeg'])->move('./UploadFiles_s'); 8 9 if($info){ 10 require_once(Env::get('root_path') . 'vendor/Qrcode/Compress.php'); 11 12 $image = $info->getSaveName(); 13 $source = $_SERVER['DOCUMENT_ROOT'] .'/UploadFiles_s/' . $image; 14 $dst_img = $_SERVER['DOCUMENT_ROOT'] .'/UploadFiles_s/' . $image; 15 16 $percent = 0.6; #缩放比例 17 $image = (new \Compress($source,$percent))->compressImg($dst_img); 18 19 // 成功上传后 获取上传信息 20 $file_info = $info->getInfo(); 21 $response = [ 22 'code' => 0, 23 'success' => true, 24 'oldName' => $info->getFilename(), 25 'fileSuffixes' => $info->getExtension(), 26 'saveName' => $info->getSaveName(), 27 'file_info' => $file_info 28 ]; 29 }else{ 30 $response = [ 31 'code' => 1, 32 'success' => false 33 ]; 34 } 35 die(json_encode($response)); 36 }
