\u6ce8\u610falpha\u901a\u9053\u7684\u7684\u62f7\u8d1d \u4e0d\u7136png\u56fe\u7247\u4f1a\u6709\u95ee\u9898<\/p>\n\n\n\n
<?php\n\n\nnamespace App\\Models\\pub;\n\n\/**\n * \u56fe\u7247\u538b\u7f29\u7c7b\uff1a\u901a\u8fc7\u7f29\u653e\u6765\u538b\u7f29\u3002\n * \u5982\u679c\u8981\u4fdd\u6301\u6e90\u56fe\u6bd4\u4f8b\uff0c\u628a\u53c2\u6570$percent\u4fdd\u6301\u4e3a\u5373\u53ef\u3002\n * \u5373\u4f7f\u539f\u6bd4\u4f8b\u538b\u7f29\uff0c\u4e5f\u53ef\u5927\u5e45\u5ea6\u7f29\u5c0f\u3002\u6570\u7801\u76f8\u673aM\u56fe\u7247\u3002\u4e5f\u53ef\u4ee5\u7f29\u4e3aKB\u5de6\u53f3\u3002\u5982\u679c\u7f29\u5c0f\u6bd4\u4f8b\uff0c\u5219\u4f53\u79ef\u4f1a\u66f4\u5c0f\u3002\n *\n * \u7ed3\u679c\uff1a\u53ef\u4fdd\u5b58\u3001\u53ef\u76f4\u63a5\u663e\u793a\u3002\n *\/\n<\/em>class ImgCompress\n{\n private $src;\n private $image;\n private $imageinfo;\n private $percent;\n const PERCENT <\/em>= 1;\n \/**\n * \u56fe\u7247\u538b\u7f29\n * <\/em>@param <\/em><\/strong>$src string \u6e90\u56fe\n * <\/em>@param <\/em><\/strong>float $percent \u538b\u7f29\u6bd4\u4f8b\n *\/\n <\/em>public function __construct($src, $percent)\n {\n $this->src = $src;\n $this->percent = $percent;\n }\n\n \/** \u9ad8\u6e05\u538b\u7f29\u56fe\u7247\n * <\/em>@param <\/em><\/strong>string $saveName \u63d0\u4f9b\u56fe\u7247\u540d\uff08\u53ef\u4e0d\u5e26\u6269\u5c55\u540d\uff0c\u7528\u6e90\u56fe\u6269\u5c55\u540d\uff09\u7528\u4e8e\u4fdd\u5b58\u3002\u6216\u4e0d\u63d0\u4f9b\u6587\u4ef6\u540d\u76f4\u63a5\u663e\u793a\n *\/\n <\/em>public function compressImg($saveName='')\n {\n $this->_openImage();\n if(!empty($saveName)) $this->_saveImage($saveName); \/\/\u4fdd\u5b58\n else $this->_showImage();\n }\n \/**\n * \u5185\u90e8\uff1a\u6253\u5f00\u56fe\u7247\n *\/\n <\/em>private function _openImage()\n {\n list($width, $height, $type, $attr) = getimagesize($this->src);\n $this->imageinfo = array(\n 'width'=>$width,\n 'height'=>$height,\n 'type'=>image_type_to_extension($type,false),\n 'attr'=>$attr\n );\n $fun = \"imagecreatefrom\".$this->imageinfo['type'];\n $this->image = $fun($this->src);\n $this->_thumpImage();\n }\n \/**\n * \u5185\u90e8\uff1a\u64cd\u4f5c\u56fe\u7247\n *\/\n <\/em>private function _thumpImage()\n {\n $new_width = $this->imageinfo['width'] * $this->percent;\n $new_height = $this->imageinfo['height'] * $this->percent;\n $image_thump = imagecreatetruecolor($new_width,$new_height);\n $alpha = imagecolorallocatealpha($image_thump, 0, 0, 0, 127);\n imagefill($image_thump, 0, 0, $alpha);<\/strong>\n \/\/$color = imagecolorallocate($image_thump,255,255,255);\n \/\/imagecolortransparent($image_thump,$color);\n \/\/imagefill($image_thump,0,0,$color);\n \/\/\u5c06\u539f\u56fe\u590d\u5236\u5e26\u56fe\u7247\u8f7d\u4f53\u4e0a\u9762\uff0c\u5e76\u4e14\u6309\u7167\u4e00\u5b9a\u6bd4\u4f8b\u538b\u7f29,\u6781\u5927\u7684\u4fdd\u6301\u4e86\u6e05\u6670\u5ea6\n imagecopyresampled($image_thump,$this->image,0,0,0,0,$new_width,$new_height,$this->imageinfo['width'],$this->imageinfo['height']);\n imagedestroy($this->image);\n $this->image = $image_thump;\n }\n \/**\n * \u8f93\u51fa\u56fe\u7247:\u4fdd\u5b58\u56fe\u7247\u5219\u7528saveImage()\n *\/\n <\/em>private function _showImage()\n {\n header('Content-Type: image\/'.$this->imageinfo['type']);\n $funcs = \"image\".$this->imageinfo['type'];\n $funcs($this->image);\n }\n \/**\n * \u4fdd\u5b58\u56fe\u7247\u5230\u786c\u76d8\uff1a\n * <\/em>@param <\/em><\/strong>string $dstImgName \u3001\u53ef\u6307\u5b9a\u5b57\u7b26\u4e32\u4e0d\u5e26\u540e\u7f00\u7684\u540d\u79f0\uff0c\u4f7f\u7528\u6e90\u56fe\u6269\u5c55\u540d \u3002\u3001\u76f4\u63a5\u6307\u5b9a\u76ee\u6807\u56fe\u7247\u540d\u5e26\u6269\u5c55\u540d\u3002\n *\/\n <\/em>private function _saveImage($dstImgName)\n {\n if(empty($dstImgName)) return false;\n $allowImgs = ['.jpg', '.jpeg', '.png', '.bmp', '.wbmp','.gif']; \/\/\u5982\u679c\u76ee\u6807\u56fe\u7247\u540d\u6709\u540e\u7f00\u5c31\u7528\u76ee\u6807\u56fe\u7247\u6269\u5c55\u540d \u540e\u7f00\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u5219\u7528\u6e90\u56fe\u7684\u6269\u5c55\u540d\n $dstExt = strrchr($dstImgName ,\".\");\n $sourseExt = strrchr($this->src ,\".\");\n if(!empty($dstExt)) $dstExt =strtolower($dstExt);\n if(!empty($sourseExt)) $sourseExt =strtolower($sourseExt);\n \/\/\u6709\u6307\u5b9a\u76ee\u6807\u540d\u6269\u5c55\u540d\n if(!empty($dstExt) && in_array($dstExt,$allowImgs)){\n $dstName = $dstImgName;\n }elseif(!empty($sourseExt) && in_array($sourseExt,$allowImgs)){\n $dstName = $dstImgName.$sourseExt;\n }else{\n $dstName = $dstImgName.$this->imageinfo['type'];\n }\n $funcs = \"image\".$this->imageinfo['type'];\n imagesavealpha($this->image, true);<\/strong>\n $funcs($this->image,$dstName);\n }\n\n public static function getImagetype($filename)\n {\n $file = fopen($filename, 'rb');\n $bin = fread($file, 2); \/\/\u53ea\u8bfb2\u5b57\u8282\n fclose($file);\n $strInfo = @unpack('C2chars', $bin);\n $typeCode = intval($strInfo['chars1'].$strInfo['chars2']);\n \/\/ dd($typeCode);\n $fileType = '';\n switch ($typeCode) {\n case 255216:\n $fileType = 'jpg';\n break;\n case 7173:\n $fileType = 'gif';\n break;\n case 6677:\n $fileType = 'bmp';\n break;\n case 13780:\n $fileType = 'png';\n break;\n default:\n $fileType = '\u53ea\u80fd\u4e0a\u4f20\u56fe\u7247\u7c7b\u578b\u683c\u5f0f';\n }\n \/\/ if ($strInfo['chars1']=='-1' AND $strInfo['chars2']=='-40' ) return 'jpg';\n \/\/ if ($strInfo['chars1']=='-119' AND $strInfo['chars2']=='80' ) return 'png';\n if(!in_array($fileType, ['jpg', 'jpeg', 'gif', 'bmp', 'png'])) {\n return false;\n }\n return true;\n }\n\n \/**\n * \u9500\u6bc1\u56fe\u7247\n *\/\n <\/em>public function __destruct(){\n imagedestroy($this->image);\n }\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"\u6ce8\u610falpha\u901a\u9053\u7684\u7684\u62f7\u8d1d \u4e0d\u7136png\u56fe\u7247\u4f1a\u6709\u95ee\u9898…<\/p>\n