php將圖片保存為不同尺寸圖片的圖片類實例_PHP教程
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這篇文章主要介紹了php將圖片保存為不同尺寸圖片的圖片類,涉及php圖片操作的保存、復制、縮略圖等常用技巧,并封裝成一個類文件以便于調用,非常具有實用價值,需要的朋友可以參考下
本文實例講述了php將圖片保存為不同規格的圖片類。分享給大家供大家參考。具體如下：
圖片處理類.imagecls.php如下：
- <?php
- /**
- 圖片處理類
- */
- class imagecls
- {
- /**
- * 文件信息
- */
- var $file = array();
- /**
- * 保存目錄
- */
- var $dir = '';
- /**
- * 錯誤代碼
- */
- var $error_code = 0;
- /**
- * 文件上傳最大KB
- */
- var $max_size = -1;
- function es_imagecls()
- {
- }
- private function checkSize($size)
- {
- return !($size > $this->max_size) || (-1 == $this->max_size);
- }
- /**
- * 處理上傳文件
- * @param array $file 上傳的文件
- * @param string $dir 保存的目錄
- * @return bool
- */
- function init($file, $dir = 'temp')
- {
- if(!is_array($file) || emptyempty($file) || !$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'; //相對
- $file['local_target'] = APP_ROOT_PATH."public/".$file['file_dir'].'/'.$file['prefix'].'.jpg'; //物理
- $this->file = &$file;
- $this->error_code = 0;
- return true;
- }
- }
- /**
- * 保存文件
- * @return bool
- */
- function save()
- {
- if(emptyempty($this->file) || emptyempty($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;
- }
- /**
- * 獲取錯誤代碼
- * @return number
- */
- function error()
- {
- return $this->error_code;
- }
- /**
- * 獲取文件擴展名
- * @return string
- */
- function fileExt($file_name)
- {
- return addslashes(strtolower(substr(strrchr($file_name, '.'), 1, 10)));
- }
- /**
- * 根據擴展名判斷文件是否為圖像
- * @param string $ext 擴展名
- * @return bool
- */
- function isImageExt($ext)
- {
- static $img_ext = array('jpg', 'jpeg', 'png', 'bmp','gif','giff');
- return in_array($ext, $img_ext) ? 1 : 0;
- }
- /**
- * 獲取圖像信息
- * @param string $target 文件路徑
- * @return mixed
- */
- function getImageInfo($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, $type) = !emptyempty($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;
- }
- /**
- * 獲取是否充許上傳文件
- * @param string $source 文件路徑
- * @return bool
- */
- function isUploadFile($source)
- {
- return $source && ($source != 'none') && (is_uploaded_file($source) || is_uploaded_file(str_replace('\\\\', '\\', $source)));
- }
- /**
- * 獲取保存的路徑
- * @param string $dir 指定的保存目錄
- * @return string
- */
- function getTargetDir($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 源文件路徑
- * @param string $target 目錄文件路徑
- * @return bool
- */
- private function saveFile($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); // 計算縮放比例
- 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 = $basefilename[0];
- if(emptyempty($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)
- {
- // 超過原圖大小不再縮略
- $width = $srcWidth;
- $height = $srcHeight;
- if(!$is_preview)
- {
- //非預覽模式寫入原圖
- file_put_contents($thumbname,file_get_contents($image)); //用原圖寫入
- return array('url'=>$thumburl,'path'=>$thumbname);
- }
- }
- else
- {
- // 縮略圖尺寸
- $width = (int)($srcWidth*$scale);
- $height = (int)($srcHeight*$scale);
- }
- if($gen == 1)
- {
- $width = $maxWidth;
- $height = $maxHeight;
- }
- // 載入原圖
- $createFun = 'imagecreatefrom'.($type=='jpg'?'jpeg':$type);
- if(!function_exists($createFun))
- $createFun = 'imagecreatefromjpeg';
- $srcImg = $createFun($image);
- //創建縮略圖
- 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) / $srcWidth;
- }
- }
- // 復制圖片
- if(function_exists("imagecopyresampled"))
- imagecopyresampled($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); // 指派一個綠色
- imagecolortransparent($thumbImg,$background_color); // 設置為透明色，若注釋掉該行則輸出綠色的圖
- }
- // 對jpeg圖形設置隔行掃描
- if('jpg'==$type || 'jpeg'==$type)
- imageinterlace($thumbImg,$interlace);
- // 生成圖片
- 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); // 計算縮放比例
- elseif($maxWidth == 0)
- $scale = $maxHeight/$srcHeight;
- elseif($maxHeight == 0)
- $scale = $maxWidth/$srcWidth;
- if($scale >= 1)
- {
- // 超過原圖大小不再縮略
- $width = $srcWidth;
- $height = $srcHeight;
- }
- else
- {
- // 縮略圖尺寸
- $width = (int)($srcWidth*$scale);
- $height = (int)($srcHeight*$scale);
- }
- if($gen == 1)
- {
- $width = $maxWidth;
- $height = $maxHeight;
- }
- //創建縮略圖
- if($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) / $srcWidth;
- }
- }
- // 復制圖片
- if(function_exists("imagecopyresampled"))
- imagecopyresampled($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); // 指派一個綠色
- imagecolortransparent($thumbImg,$background_color); // 設置為透明色，若注釋掉該行則輸出綠色的圖
- }
- // 對jpeg圖形設置隔行掃描
- if('jpg'==$type || 'jpeg'==$type)
- imageinterlace($thumbImg,$interlace);
- return $thumbImg;
- }
- public function water($source,$water,$alpha=80,$position="0")
- {
- //檢查文件是否存在
- if(!file_exists($source)||!file_exists($water))
- return false;
- //圖片信息
- $sInfo = es_imagecls::getImageInfo($source);
- $wInfo = es_imagecls::getImageInfo($water);
- //如果圖片小于水印圖片，不生成圖片
- if($sInfo["0"] < $wInfo["0"] || $sInfo['1'] < $wInfo['1'])
- return false;
- if(is_animated_gif($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));
- //為im加水印
- $sImage=$im;
- $wCreateFun="imagecreatefrom".$wInfo['type'];
- if(!function_exists($wCreateFun))
- $wCreateFun = 'imagecreatefromjpeg';
- $wImage=$wCreateFun($water);
- //設定圖像的混色模式
- imagealphablending($wImage, true);
- switch (intval($position))
- {
- case 0: break;
- //左上
- case 1:
- $posY=0;
- $posX=0;
- //生成混合圖像
- imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
- break;
- //右上
- case 2:
- $posY=0;
- $posX=$sInfo[0]-$wInfo[0];
- //生成混合圖像
- imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
- break;
- //左下
- case 3:
- $posY=$sInfo[1]-$wInfo[1];
- $posX=0;
- //生成混合圖像
- imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
- break;
- //右下
- case 4:
- $posY=$sInfo[1]-$wInfo[1];
- $posX=$sInfo[0]-$wInfo[0];
- //生成混合圖像
- imagecopymerge($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-$wInfo[0]/2;
- //生成混合圖像
- imagecopymerge($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為二進制 url為地址
- );
- $image_rs = $gif_maker->GetAnimation ( );
- //如果沒有給出保存文件名，默認為原圖像名
- @unlink($source);
- //保存圖像
- file_put_contents($source,$image_rs);
- return true;
- }
- //建立圖像
- $sCreateFun="imagecreatefrom".$sInfo['type'];
- if(!function_exists($sCreateFun))
- $sCreateFun = 'imagecreatefromjpeg';
- $sImage=$sCreateFun($source);
- $wCreateFun="imagecreatefrom".$wInfo['type'];
- if(!function_exists($wCreateFun))
- $wCreateFun = 'imagecreatefromjpeg';
- $wImage=$wCreateFun($water);
- //設定圖像的混色模式
- imagealphablending($wImage, true);
- switch (intval($position))
- {
- case 0: break;
- //左上
- case 1:
- $posY=0;
- $posX=0;
- //生成混合圖像
- imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
- break;
- //右上
- case 2:
- $posY=0;
- $posX=$sInfo[0]-$wInfo[0];
- //生成混合圖像
- imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
- break;
- //左下
- case 3:
- $posY=$sInfo[1]-$wInfo[1];
- $posX=0;
- //生成混合圖像
- imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
- break;
- //右下
- case 4:
- $posY=$sInfo[1]-$wInfo[1];
- $posX=$sInfo[0]-$wInfo[0];
- //生成混合圖像
- imagecopymerge($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-$wInfo[0]/2;
- //生成混合圖像
- imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha);
- break;
- }
- //如果沒有給出保存文件名，默認為原圖像名
- @unlink($source);
- //保存圖像
- imagejpeg($sImage,$source,100);
- imagedestroy($sImage);
- }
- }
- if(!function_exists('image_type_to_extension'))
- {
- function image_type_to_extension($imagetype)
- {
- if(emptyempty($imagetype))
- return false;
- switch($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()調用圖片類,然后再用下面的方法保存不同規格的圖片并返回圖片連接
- //獲取相應規格的圖片地址
- //gen=0:保持比例縮放，不剪裁,如高為0，則保證寬度按比例縮放 gen=1：保證長寬，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:
- //im:將店鋪圖片保存為3種規格:小圖:48x48,中圖120x120,大圖200x200
- $small_url=get_spec_image($data['image'],48,48,0);
- $<span id="result_box" class="short_text" lang="en"><span>middle_url</span></span>=get_spec_image($data['image'],120,120,0);
- $big_url=get_spec_image($data['image'],200,200,0);
希望本文所述對大家的php程序設計有所幫助。
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PHP教程-php將圖片保存為不同尺寸圖片的圖片類實例
。