php将图片保存为不同尺寸图片的图片类实例

php将图片保存为不同尺寸图片的图片类实例

这篇文章主要介绍了php将图片保存为不同尺寸图片的图片类,涉及php图片操作的保存、复制、缩略图等常用技巧,并封装成一个类文件以便于调用,非常具有实用价值,需要的朋友可以参考下

本文实例讲述了php将图片保存为不同规格的图片类。分享给大家供大家参考。具体如下：

图片处理类.imagecls.php如下：

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/** 图片处理类 */ class imagecls { /** * 文件信息 */ var $file = array(); /** * 保存目录 */ var $dir = ''; /** * 错误代码 */ var $error_code = 0; /** * 文件上传最大KB */ var $max_size = -1; function es_imagecls() { } private function checkSize($size) { return !($size > $this->max_size) || (-1 == $this->max_size); } /** * 处理上传文件 * @param array $file 上传的文件 * @param string $dir 保存的目录 * @return bool */ function init($file, $dir = 'temp') { if(!is_array($file) || empty($file) || !$this->isUploadFile($file['tmp_name']) || trim($file['name']) == '' || $file['size'] == 0) { $this->file = array(); $this->error_code = -1; return false; } else { $file['size'] = intval($file['size']); $file['name'] = trim($file['name']); $file['thumb'] = ''; $file['ext'] = $this->fileExt($file['name']); $file['name'] = htmlspecialchars($file['name'], ENT_QUOTES); $file['is_image'] = $this->isImageExt($file['ext']); $file['file_dir'] = $this->getTargetDir($dir); $file['prefix'] = md5(microtime(true)).rand(10,99); $file['target'] = "./public/".$file['file_dir'].'/'.$file['prefix'].'.jpg'; //相对 $file['local_target'] = APP_ROOT_PATH."public/".$file['file_dir'].'/'.$file['prefix'].'.jpg'; //物理 $this->file = &$file; $this->error_code = 0; return true; } } /** * 保存文件 * @return bool */ function save() { if(empty($this->file) || empty($this->file['tmp_name'])) $this->error_code = -101; elseif(!$this->checkSize($this->file['size'])) $this->error_code = -105; elseif(!$this->file['is_image']) $this->error_code = -102; elseif(!$this->saveFile($this->file['tmp_name'], $this->file['local_target'])) $this->error_code = -103; elseif($this->file['is_image'] && (!$this->file['image_info'] = $this->getImageInfo($this->file['local_target'], true))) { $this->error_code = -104; @unlink($this->file['local_target']); } else { $this->error_code = 0; return true; } return false; } /** * 获取错误代码 * @return number */ function error() { return $this->error_code; } /** * 获取文件扩展名 * @return string */ function fileExt($file_name) { return addslashes(strtolower(substr(strrchr($file_name, '.'), 1, 10))); } /** * 根据扩展名判断文件是否为图像 * @param string $ext 扩展名 * @return bool */ function isImageExt($ext) { static $img_ext = array('jpg', 'jpeg', 'png', 'bmp','gif','giff'); return in_array($ext, $img_ext) ? 1 : 0; } /** * 获取图像信息 * @param string $target 文件路径 * @return mixed */ function getImageInfo($target) { $ext = es_imagecls::fileExt($target); $is_image = es_imagecls::isImageExt($ext); if(!$is_image) return false; elseif(!is_readable($target)) return false; elseif($image_info = @getimagesize($target)) { list($width, $height, $type) = !empty($image_info) ? $image_info : array('', '', ''); $size = $width * $height; if($is_image && !in_array($type, array(1,2,3,6,13))) return false; $image_info['type'] = strtolower(substr(image_type_to_extension($image_info[2]),1)); return $image_info; } else return false; } /** * 获取是否充许上传文件 * @param string $source 文件路径 * @return bool */ function isUploadFile($source) { return $source && ($source != 'none') && (is_uploaded_file($source) || is_uploaded_file(str_replace('\\\\', '\\', $source))); } /** * 获取保存的路径 * @param string $dir 指定的保存目录 * @return string */ function getTargetDir($dir) { if (!is_dir(APP_ROOT_PATH."public/".$dir)) { @mkdir(APP_ROOT_PATH."public/".$dir); @chmod(APP_ROOT_PATH."public/".$dir, 0777); } return $dir; } /** * 保存文件 * @param string $source 源文件路径 * @param string $target 目录文件路径 * @return bool */ private function saveFile($source, $target) { if(!es_imagecls::isUploadFile($source)) $succeed = false; elseif(@copy($source, $target)) $succeed = true; elseif(function_exists('move_uploaded_file') && @move_uploaded_file($source, $target)) $succeed = true; elseif (@is_readable($source) && (@$fp_s = fopen($source, 'rb')) && (@$fp_t = fopen($target, 'wb'))) { while (!feof($fp_s)) { $s = @fread($fp_s, 1024 * 512); @fwrite($fp_t, $s); } fclose($fp_s); fclose($fp_t); $succeed = true; } if($succeed) { $this->error_code = 0; @chmod($target, 0644); @unlink($source); } else { $this->error_code = 0; } return $succeed; } public function thumb($image,$maxWidth=200,$maxHeight=50,$gen = 0,$interlace=true,$filepath = '',$is_preview = true) { $info = es_imagecls::getImageInfo($image); if($info !== false) { $srcWidth = $info[0]; $srcHeight = $info[1]; $type = $info['type']; $interlace = $interlace? 1:0; unset($info); if($maxWidth > 0 && $maxHeight > 0) $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight); // 计算缩放比例 elseif($maxWidth == 0) $scale = $maxHeight/$srcHeight; elseif($maxHeight == 0) $scale = $maxWidth/$srcWidth; $paths = pathinfo($image); $paths['filename'] = trim(strtolower($paths['basename']),".".strtolower($paths['extension'])); $basefilename = explode("_",$paths['filename']); $basefilename = $basefilename[0]; if(empty($filepath)) { if($is_preview) $thumbname = $paths['dirname'].'/'.$basefilename.'_'.$maxWidth.'x'.$maxHeight.'.jpg'; else $thumbname = $paths['dirname'].'/'.$basefilename.'o_'.$maxWidth.'x'.$maxHeight.'.jpg'; } else $thumbname = $filepath; $thumburl = str_replace(APP_ROOT_PATH,'./',$thumbname); if($scale >= 1) { // 超过原图大小不再缩略 $width = $srcWidth; $height = $srcHeight; if(!$is_preview) { //非预览模式写入原图 file_put_contents($thumbname,file_get_contents($image)); //用原图写入 return array('url'=>$thumburl,'path'=>$thumbname); } } else { // 缩略图尺寸 $width = (int)($srcWidth*$scale); $height = (int)($srcHeight*$scale); } if($gen == 1) { $width = $maxWidth; $height = $maxHeight; } // 载入原图 $createFun = 'imagecreatefrom'.($type=='jpg'?'jpeg':$type); if(!function_exists($createFun)) $createFun = 'imagecreatefromjpeg'; $srcImg = $createFun($image); //创建缩略图 if($type!='gif' && function_exists('imagecreatetruecolor')) $thumbImg = imagecreatetruecolor($width, $height); else $thumbImg = imagecreate($width, $height); $x = 0; $y = 0; if($gen == 1 && $maxWidth > 0 && $maxHeight > 0) { $resize_ratio = $maxWidth/$maxHeight; $src_ratio = $srcWidth/$srcHeight; if($src_ratio >= $resize_ratio) { $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2; $width = ($height * $srcWidth) / $srcHeight; } else { $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2; $height = ($width * $srcHeight) / $srcWidth; } } // 复制图片 if(function_exists("imagecopyresampled")) imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height, $srcWidth,$srcHeight); else imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height, $srcWidth,$srcHeight); if('gif'==$type || 'png'==$type) { $background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色 imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图 } // 对jpeg图形设置隔行扫描 if('jpg'==$type || 'jpeg'==$type) imageinterlace($thumbImg,$interlace); // 生成图片 imagejpeg($thumbImg,$thumbname,100); imagedestroy($thumbImg); imagedestroy($srcImg); return array('url'=>$thumburl,'path'=>$thumbname); } return false; } public function make_thumb($srcImg,$srcWidth,$srcHeight,$type,$maxWidth=200,$maxHeight=50,$gen = 0) { $interlace = $interlace? 1:0; if($maxWidth > 0 && $maxHeight > 0) $scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight); // 计算缩放比例 elseif($maxWidth == 0) $scale = $maxHeight/$srcHeight; elseif($maxHeight == 0) $scale = $maxWidth/$srcWidth; if($scale >= 1) { // 超过原图大小不再缩略 $width = $srcWidth; $height = $srcHeight; } else { // 缩略图尺寸 $width = (int)($srcWidth*$scale); $height = (int)($srcHeight*$scale); } if($gen == 1) { $width = $maxWidth; $height = $maxHeight; } //创建缩略图 if($type!='gif' && function_exists('imagecreatetruecolor')) $thumbImg = imagecreatetruecolor($width, $height); else $thumbImg = imagecreatetruecolor($width, $height); $x = 0; $y = 0; if($gen == 1 && $maxWidth > 0 && $maxHeight > 0) { $resize_ratio = $maxWidth/$maxHeight; $src_ratio = $srcWidth/$srcHeight; if($src_ratio >= $resize_ratio) { $x = ($srcWidth - ($resize_ratio * $srcHeight)) / 2; $width = ($height * $srcWidth) / $srcHeight; } else { $y = ($srcHeight - ( (1 / $resize_ratio) * $srcWidth)) / 2; $height = ($width * $srcHeight) / $srcWidth; } } // 复制图片 if(function_exists("imagecopyresampled")) imagecopyresampled($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height, $srcWidth,$srcHeight); else imagecopyresized($thumbImg, $srcImg, 0, 0, $x, $y, $width, $height, $srcWidth,$srcHeight); if('gif'==$type || 'png'==$type) { $background_color = imagecolorallocate($thumbImg, 255,255,255); // 指派一个绿色 imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图 } // 对jpeg图形设置隔行扫描 if('jpg'==$type || 'jpeg'==$type) imageinterlace($thumbImg,$interlace); return $thumbImg; } public function water($source,$water,$alpha=80,$position="0") { //检查文件是否存在 if(!file_exists($source)||!file_exists($water)) return false; //图片信息 $sInfo = es_imagecls::getImageInfo($source); $wInfo = es_imagecls::getImageInfo($water); //如果图片小于水印图片，不生成图片 if($sInfo["0"] return false; if(is_animated_gif($source)) { require_once APP_ROOT_PATH."system/utils/gif_encoder.php"; require_once APP_ROOT_PATH."system/utils/gif_reader.php"; $gif = new GIFReader(); $gif->load($source); foreach($gif->IMGS['frames'] as $k=>$img) { $im = imagecreatefromstring($gif->getgif($k)); //为im加水印 $sImage=$im; $wCreateFun="imagecreatefrom".$wInfo['type']; if(!function_exists($wCreateFun)) $wCreateFun = 'imagecreatefromjpeg'; $wImage=$wCreateFun($water); //设定图像的混色模式 imagealphablending($wImage, true); switch (intval($position)) { case 0: break; //左上 case 1: $posY=0; $posX=0; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //右上 case 2: $posY=0; $posX=$sInfo[0]-$wInfo[0]; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //左下 case 3: $posY=$sInfo[1]-$wInfo[1]; $posX=0; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //右下 case 4: $posY=$sInfo[1]-$wInfo[1]; $posX=$sInfo[0]-$wInfo[0]; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //居中 case 5: $posY=$sInfo[1]/2-$wInfo[1]/2; $posX=$sInfo[0]/2-$wInfo[0]/2; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; } //end im加水印 ob_start(); imagegif($sImage); $content = ob_get_contents(); ob_end_clean(); $frames [ ] = $content; $framed [ ] = $img['frameDelay']; } $gif_maker = new GIFEncoder ( $frames, $framed, 0, 2, 0, 0, 0, "bin" //bin为二进制 url为地址 ); $image_rs = $gif_maker->GetAnimation ( ); //如果没有给出保存文件名，默认为原图像名 @unlink($source); //保存图像 file_put_contents($source,$image_rs); return true; } //建立图像 $sCreateFun="imagecreatefrom".$sInfo['type']; if(!function_exists($sCreateFun)) $sCreateFun = 'imagecreatefromjpeg'; $sImage=$sCreateFun($source); $wCreateFun="imagecreatefrom".$wInfo['type']; if(!function_exists($wCreateFun)) $wCreateFun = 'imagecreatefromjpeg'; $wImage=$wCreateFun($water); //设定图像的混色模式 imagealphablending($wImage, true); switch (intval($position)) { case 0: break; //左上 case 1: $posY=0; $posX=0; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //右上 case 2: $posY=0; $posX=$sInfo[0]-$wInfo[0]; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //左下 case 3: $posY=$sInfo[1]-$wInfo[1]; $posX=0; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //右下 case 4: $posY=$sInfo[1]-$wInfo[1]; $posX=$sInfo[0]-$wInfo[0]; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //居中 case 5: $posY=$sInfo[1]/2-$wInfo[1]/2; $posX=$sInfo[0]/2-$wInfo[0]/2; //生成混合图像 imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; } //如果没有给出保存文件名，默认为原图像名 @unlink($source); //保存图像 imagejpeg($sImage,$source,100); imagedestroy($sImage); } } if(!function_exists('image_type_to_extension')) { function image_type_to_extension($imagetype) { if(empty($imagetype)) return false; switch($imagetype) { case IMAGETYPE_GIF : return '.gif'; case IMAGETYPE_JPEG : return '.jpeg'; case IMAGETYPE_PNG : return '.png'; case IMAGETYPE_SWF : return '.swf'; case IMAGETYPE_PSD : return '.psd'; case IMAGETYPE_BMP : return '.bmp'; case IMAGETYPE_TIFF_II : return '.tiff'; case IMAGETYPE_TIFF_MM : return '.tiff'; case IMAGETYPE_JPC : return '.jpc'; case IMAGETYPE_JP2 : return '.jp2'; case IMAGETYPE_JPX : return '.jpf'; case IMAGETYPE_JB2 : return '.jb2'; case IMAGETYPE_SWC : return '.swc'; case IMAGETYPE_IFF : return '.aiff'; case IMAGETYPE_WBMP : return '.wbmp'; case IMAGETYPE_XBM : return '.xbm'; default : return false; } } } ?>

2.get_spec_img()调用图片类,然后再用下面的方法保存不同规格的图片并返回图片连接

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//获取相应规格的图片地址 //gen=0:保持比例缩放，不剪裁,如高为0，则保证宽度按比例缩放 gen=1：保证长宽，剪裁 function get_spec_image($img_path,$width=0,$height=0,$gen=0,$is_preview=true) { if($width==0) $new_path = $img_path; else { $img_name = substr($img_path,0,-4); $img_ext = substr($img_path,-3); if($is_preview) $new_path = $img_name."_".$width."x".$height.".jpg"; else $new_path = $img_name."o_".$width."x".$height.".jpg"; if(!file_exists($new_path)) { require_once "imagecls.php"; $imagec = new imagecls(); $thumb = $imagec->thumb($img_path,$width,$height,$gen,true,"",$is_preview); if(app_conf("PUBLIC_DOMAIN_ROOT")!='') { $paths = pathinfo($new_path); $path = str_replace("./","",$paths['dirname']); $filename = $paths['basename']; $pathwithoupublic = str_replace("public/","",$path); $file_data = @file_get_contents($path.$file); $img = @imagecreatefromstring($file_data); if($img!==false) { $save_path = "public/".$path; if(!is_dir($save_path)) { @mk_dir($save_path); } @file_put_contents($save_path.$name,$file_data); } } } } return $new_path; }

3.使用方法:

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//im:将店铺图片保存为3种规格:小图:48x48,中图120x120,大图200x200 $small_url=get_spec_image($data['image'],48,48,0); $middle_url=get_spec_image($data['image'],120,120,0); $big_url=get_spec_image($data['image'],200,200,0);

希望本文所述对大家的php程序设计有所帮助。