php图片上传类(支持缩放裁剪图片缩略功能)
Posted
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了php图片上传类(支持缩放裁剪图片缩略功能)相关的知识,希望对你有一定的参考价值。
- 代码:
/** * @author [Lee] <[<[email protected]>]> * 1、自动验证文件是表单提交的文件还是base64流提交的文件 * 2、验证图片类型是否合法 * 3、验证图片尺寸是否合法 * 4、验证图片大小是否合法 * 5、支持缩放功能 * 6、支持裁剪功能 * 7、支持缩略图功能 */ class fileuploader{ private $file; private $type; public $suffix = array(); public $measure = array(); public $size = array(); public $scale = array( ‘is_scale‘=>0, ‘ratio‘=>1 ); public $crop = array( ‘is_crop‘=>0, ‘width‘=>0, ‘height‘=>0 ); public $thumb = array( ‘is_thumb‘=>0, ‘width‘=>0, ‘height‘=>0 ); public function __construct($file){ $this->file = $file; $this->getType(); } /* 内部方法:获取图片类型 1、多文件 2、单文件 3、base64流文件 */ private function getType(){ $file = $this->file; if(is_array($file)){ // 多文件 if(is_array($file[‘name‘])){ $type = 1; }else{ // 单文件 $type = 2; } }else{ $type = 3; } $this->type = $type; } /* 内部方法:获取图片后缀 @param path 图片路径 @return suffix 后缀名 如:jpg */ private function getSuffix($path) { $file = fopen($path, "rb"); $bin = fread($file, 2); // 只读2字节 fclose($file); $strInfo = @unpack("C2chars", $bin); $typeCode = intval($strInfo[‘chars1‘] . $strInfo[‘chars2‘]); $suffix = "unknow"; if($typeCode == 255216){ $suffix = "jpg"; }elseif($typeCode == 7173){ $suffix = "gif"; }elseif($typeCode == 13780){ $suffix = "png"; }elseif($typeCode == 6677){ $suffix = "bmp"; }elseif($typeCode == 7798){ $suffix = "exe"; }elseif($typeCode == 7784){ $suffix = "midi"; }elseif($typeCode == 8297){ $suffix = "rar"; }elseif($typeCode == 7368){ $suffix = "mp3"; }elseif($typeCode == 0){ $suffix = "mp4"; }elseif($typeCode == 8273){ $suffix = "wav"; } return $suffix; } /* 内部方法:保存流文件 @param stream 文件流 @param suffix 后缀 @param dir 保存文件夹 @return path 文件路径 */ private function uploadBase64($stream,$suffix,$dir) { if (empty($stream)) return false; if (preg_match(‘/^(data:(\s)?(image|img)\/(\w+);base64,)/‘, $stream, $str)) { $path = $dir . md5(rand(100000, 999999)) . ".{$suffix}"; if (file_put_contents($path, base64_decode(str_replace($str[1], ‘‘, $stream)))) { return $path; } else { return false; } } else { return false; } } /* 校验文件类型是否合法 @return ret true:合法 false:非法 */ public function checkType(){ $file = $this->file; $type = $this->type; $validSuffix = $this->suffix; $ret = true; if($type==1){ // 多文件 foreach($file[‘tmp_name‘] as $v){ $suffix = $this->getSuffix($v); if(!in_array($suffix,$validSuffix)){ $ret = false; break; } } }elseif($type==2){ // 单文件 $suffix = $this->getSuffix($file[‘tmp_name‘]); if(!in_array($suffix,$validSuffix)){ $ret = false; } }else{ // base64文件 $suffix = $this->getSuffix($file); if(!in_array($suffix,$validSuffix)){ $ret = false; } } return $ret; } /* 校验文件尺寸是否合法 @return ret true:合法 false:非法 */ public function checkMeasure(){ $file = $this->file; $type = $this->type; $validMeasure = $this->measure; $ret = true; if($type==1){ // 多文件 foreach($file[‘tmp_name‘] as $v){ $measure = getimagesize($v); $width = $measure[0]; $height = $measure[1]; if(($width < $validMeasure[‘width‘][0] || $width > $validMeasure[‘width‘][1]) || ($height < $validMeasure[‘height‘][0] || $height > $validMeasure[‘height‘][1])){ $ret = false; break; } } }elseif($type==2){ // 单文件 $measure = getimagesize($file[‘tmp_name‘]); $width = $measure[0]; $height = $measure[1]; if(($width < $validMeasure[‘width‘][0] || $width > $validMeasure[‘width‘][1]) || ($height < $validMeasure[‘height‘][0] || $height > $validMeasure[‘height‘][1])){ $ret = false; } }else{ // base64文件 $measure = getimagesize($file); $width = $measure[0]; $height = $measure[1]; if(($width < $validMeasure[‘width‘][0] || $width > $validMeasure[‘width‘][1]) || ($height < $validMeasure[‘height‘][0] || $height > $validMeasure[‘height‘][1])){ $ret = false; } } return $ret; } /* 校验文件大小是否合法 @return ret true:合法 false:非法 */ public function checkSize(){ $file = $this->file; $type = $this->type; $validSize = $this->size; $ret = true; if($type==1){ // 多文件 foreach($file[‘tmp_name‘] as $v){ $size = filesize($v); if(($size < $validSize[‘min‘]*1024*1024) || ($size > $validSize[‘max‘]*1024*1024)){ $ret = false; break; } } }elseif($type==2){ // 单文件 $size = filesize($file[‘tmp_name‘]); if(($size < $validSize[‘min‘]*1024*1024) || ($size > $validSize[‘max‘]*1024*1024)){ $ret = false; } }else{ // base64文件 $size = filesize($file); if(($size < $validSize[‘min‘]*1024*1024) || ($size > $validSize[‘max‘]*1024*1024)){ $ret = false; } } return $ret; } /* 内部方法:缩放图片 */ private function scale($path,$suffix,$ratio){ list($width, $height) = getimagesize($path); $new_w = $ratio * $width; $new_h = $ratio * $height; $new_s = imagecreatetruecolor($new_w, $new_h); if(in_array($suffix,array(‘jpg‘,‘jpeg‘))){ $img = imagecreatefromjpeg($path); }elseif($suffix == ‘png‘){ $img = imagecreatefrompng($path); }elseif($suffix == ‘gif‘){ $img = imagecreatefromgif($path); }else{ return false; } $ret1 = imagecopyresized($new_s, $img, 0, 0, 0, 0, $new_w, $new_h, $width, $height); if(in_array($suffix,array(‘jpg‘,‘jpeg‘))){ $ret2 = imagejpeg($new_s, $path); }elseif($suffix == ‘png‘){ $ret2 = imagepng($new_s, $path); }elseif($suffix == ‘gif‘){ $ret2 = imagegif($new_s, $path); }else{ return false; } imagedestroy($new_s); imagedestroy($img); if($ret1 && $ret2){ return $path; }else{ return false; } } /* 内部方法:裁剪图片 */ private function crop($path,$suffix,$cut_width,$cut_height){ $cut_x; $cut_y; $min; $size = getimagesize($path); $width = $size[0]; $height = $size[1]; $min = min($width,$height); $cut_width = ($cut_width > $min)?$min:$cut_width; $cut_height = ($cut_height > $min)?$min:$cut_height; $cut_x = ($width - $cut_width) / 2; $cut_y = ($height - $cut_height) / 2; if(in_array($suffix,array(‘jpg‘,‘jpeg‘))){ $img = imagecreatefromjpeg($path); }elseif($suffix == ‘png‘){ $img = imagecreatefrompng($path); }elseif($suffix == ‘gif‘){ $img = imagecreatefromgif($path); }else{ return false; } $new_s = imagecreatetruecolor($cut_width, $cut_height); $ret1 = imagecopyresampled($new_s, $img, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height, $cut_width, $cut_height); if(in_array($suffix,array(‘jpg‘,‘jpeg‘))){ $ret2 = imagejpeg($new_s, $path); }elseif($suffix == ‘png‘){ $ret2 = imagepng($new_s, $path); }elseif($suffix == ‘gif‘){ $ret2 = imagegif($new_s, $path); }else{ return false; } imagedestroy($new_s); imagedestroy($img); if($ret1 && $ret2){ return $path; }else{ return false; } } /* 内部方法:生成缩略图 */ private function thumb($path,$suffix,$cut_width,$cut_height){ $cut_x; $cut_y; $ratio = 1; $size = getimagesize($path); $width = $size[0]; $height = $size[1]; $cw; $ch; if($width/$height >= $cut_width/$cut_height){ $ratio = $cut_height / $height; }else{ $ratio = $cut_width / $width; } $path = $this->scale($path,$suffix,$ratio,$path); $width *= $ratio; $height *= $ratio; $cut_x = abs($cut_width - $width) / 2; $cut_y = abs($cut_height - $height) / 2; if(in_array($suffix,array(‘jpg‘,‘jpeg‘))){ $img = imagecreatefromjpeg($path); }elseif($suffix == ‘png‘){ $img = imagecreatefrompng($path); }elseif($suffix == ‘gif‘){ $img = imagecreatefromgif($path); }else{ return false; } $new_s = imagecreatetruecolor($cut_width, $cut_height); $ret1 = imagecopyresampled($new_s, $img, 0, 0, $cut_x, $cut_y, $cut_width, $cut_height, $cut_width, $cut_height); if(in_array($suffix,array(‘jpg‘,‘jpeg‘))){ $ret2 = imagejpeg($new_s, $path); }elseif($suffix == ‘png‘){ $ret2 = imagepng($new_s, $path); }elseif($suffix == ‘gif‘){ $ret2 = imagegif($new_s, $path); }else{ return false; } imagedestroy($new_s); imagedestroy($img); if($ret1 && $ret2){ return $path; }else{ return false; } } /* 保存 @param dir 存储的文件夹 如:‘./‘ @return ret 存储的文件路径 如:‘./test.jpg‘ */ public function save($dir){ $file = $this->file; $type = $this->type; $scale = $this->scale; $crop = $this->crop; $thumb = $this->thumb; $is_scale = $scale[‘is_scale‘]; $is_crop = $crop[‘is_crop‘]; $is_thumb = $thumb[‘is_thumb‘]; $ratio = $scale[‘ratio‘]; $crop_width = $crop[‘width‘]; $crop_height = $crop[‘height‘]; $thumb_width = $thumb[‘width‘]; $thumb_height = $thumb[‘height‘]; if($type==1){ // 多文件 foreach($file[‘tmp_name‘] as $k=>$v){ $suffix = $this->getSuffix($v); $name = $dir.md5(rand(100000,999999)).‘.‘.$suffix; $flag = file_put_contents($name,file_get_contents($v)); if(!$flag){ $ret = false; }else{ if($is_scale){ $name = $this->scale($name,$suffix,$ratio); } if($is_crop){ $name = $this->crop($name,$suffix,$crop_width,$crop_height); } if($is_thumb){ $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height); } $ret[$k] = $name; } } }elseif($type==2){ // 单文件 $suffix = $this->getSuffix($file[‘tmp_name‘]); $name = $dir.md5(rand(100000,999999)).‘.‘.$suffix; $flag = file_put_contents($name,file_get_contents($file[‘tmp_name‘])); if(!$flag){ $ret = false; }else{ if($is_scale){ $name = $this->scale($name,$suffix,$ratio); } if($is_crop){ $name = $this->crop($name,$suffix,$crop_width,$crop_height); } if($is_thumb){ $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height); } $ret = $name; } }else{ // base64文件 $suffix = $this->getSuffix($file); $name = $dir.md5(rand(100000,999999)).‘.‘.$suffix; $flag = file_put_contents($name,file_get_contents($file)); if(!$flag){ $ret = false; }else{ if($is_scale){ $name = $this->scale($name,$suffix,$ratio); } if($is_crop){ $name = $this->crop($name,$suffix,$crop_width,$crop_height); } if($is_thumb){ $name = $this->thumb($name,$suffix,$thumb_width,$thumb_height); } $ret = $name; } } return $ret; } }
- 示例用法:
$file = $_FILES[‘file‘]; $fileuploader = new fileuploader($file); $fileuploader->thumb = array( ‘is_thumb‘=>1, ‘width‘=>200, ‘height‘=>500 ); $ret = $fileuploader->save(‘./‘); var_dump($ret);
以上是关于php图片上传类(支持缩放裁剪图片缩略功能)的主要内容,如果未能解决你的问题,请参考以下文章
Java图片缩略图裁剪水印缩放旋转压缩转格式-Thumbnailator图像处理