The example in this article describes how PHP saves images into image classes of different specifications. Share it with everyone for your reference. The details are as follows:
Image processing class.imagecls.php is as follows:
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/** Image processing class */ class imagecls { /** * File information */ var $file = array(); /** * Save directory */ var $dir = ''; /** * Error code */ var $error_code = 0; /** * Maximum file upload size KB */ var $max_size = -1; function es_imagecls() { } private function checkSize($size) { return !($size > $this->max_size) || (-1 == $this->max_size); } /** * Process uploaded files * @param array $file Uploaded file * @param string $dir saved directory * @return bool */ function init($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; $this->error_code = 0; return true; } } /** * Save file * @return bool */ function save() { if(empty($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; } /** * Get error code * @return number */ function error() { return $this->error_code; } /** * Get file extension * @return string */ function fileExt($file_name) { return addslashes(strtolower(substr(strrchr($file_name, '.'), 1, 10))); } /** * Determine whether the file is an image based on the extension * @param string $ext extension * @return bool */ function isImageExt($ext) { static $img_ext = array('jpg', 'jpeg', 'png', 'bmp','gif','giff'); return in_array($ext, $img_ext) ? 1 : 0; } /** * Get image information * @param string $target file path * @return mixed */ function getImageInfo($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; } /** * Get whether uploading files is allowed * @param string $source file path * @return bool */ function isUploadFile($source) { return $source && ($source != 'none') && (is_uploaded_file($source) || is_uploaded_file(str_replace('\\', '\', $source))); } /** * Get the saved path * @param string $dir specified saving directory * @return string */ function getTargetDir($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) / $srcWidth; } } //Copy image if(function_exists("imagecopyresampled")) imagecopyresampled($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); // Assign a green color imagecolortransparent($thumbImg,$background_color); // Set to transparent color, if this line is commented out, a green image will be output } //Set interlacing for jpeg graphics if('jpg'==$type || 'jpeg'==$type) imageinterlace($thumbImg,$interlace); // Generate pictures 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); // Calculate scaling ratio elseif($maxWidth == 0) $scale = $maxHeight/$srcHeight; elseif($maxHeight == 0) $scale = $maxWidth/$srcWidth; if($scale >= 1) { //No thumbnails will be made if the image exceeds the original size $width = $srcWidth; $height = $srcHeight; } else { //Thumbnail size $width = (int)($srcWidth*$scale); $height = (int)($srcHeight*$scale); } if($gen == 1) { $width = $maxWidth; $height = $maxHeight; } //Create thumbnail if($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) / $srcWidth; } } //Copy image if(function_exists("imagecopyresampled")) imagecopyresampled($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); // Assign a green imagecolortransparent($thumbImg,$background_color); // Set to transparent color. If this line is commented out, a green image will be output } //Set interlacing for jpeg graphics if('jpg'==$type || 'jpeg'==$type) imageinterlace($thumbImg,$interlace); return $thumbImg; } public function water($source,$water,$alpha=80,$position="0") { //Check if the file exists if(!file_exists($source)||!file_exists($water)) return false; //Picture information $sInfo = es_imagecls::getImageInfo($source); $wInfo = es_imagecls::getImageInfo($water); //If the image is smaller than the watermark image, no image will be generated 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)); //Add watermark to im $sImage=$im; $wCreateFun="imagecreatefrom".$wInfo['type']; if(!function_exists($wCreateFun)) $wCreateFun = 'imagecreatefromjpeg'; $wImage=$wCreateFun($water); //Set the color mixing mode of the image imagealphablending($wImage, true); switch (intval($position)) { case 0: break; //Top left case 1: $posY=0; $posX=0; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //Upper right case 2: $posY=0; $posX=$sInfo[0]-$wInfo[0]; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //Lower left case 3: $posY=$sInfo[1]-$wInfo[1]; $posX=0; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //Bottom right case 4: $posY=$sInfo[1]-$wInfo[1]; $posX=$sInfo[0]-$wInfo[0]; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //Centered case 5: $posY=$sInfo[1]/2-$wInfo[1]/2; $posX=$sInfo[0]/2-$wInfo[0]/2; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; } //end im watermarked ob_start(); imagegif($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 is binary and url is the address ); $image_rs = $gif_maker->GetAnimation ( ); //If no save file name is given, the default is the original image name @unlink($source); //Save image file_put_contents($source,$image_rs); return true; } //Create image $sCreateFun="imagecreatefrom".$sInfo['type']; if(!function_exists($sCreateFun)) $sCreateFun = 'imagecreatefromjpeg'; $sImage=$sCreateFun($source); $wCreateFun="imagecreatefrom".$wInfo['type']; if(!function_exists($wCreateFun)) $wCreateFun = 'imagecreatefromjpeg'; $wImage=$wCreateFun($water); //Set the color mixing mode of the image imagealphablending($wImage, true); switch (intval($position)) { case 0: break; //Top left case 1: $posY=0; $posX=0; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //Upper right case 2: $posY=0; $posX=$sInfo[0]-$wInfo[0]; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //Lower left case 3: $posY=$sInfo[1]-$wInfo[1]; $posX=0; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //Bottom right case 4: $posY=$sInfo[1]-$wInfo[1]; $posX=$sInfo[0]-$wInfo[0]; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; //Centered case 5: $posY=$sInfo[1]/2-$wInfo[1]/2; $posX=$sInfo[0]/2-$wInfo[0]/2; //Generate mixed image imagecopymerge($sImage, $wImage, $posX, $posY, 0, 0, $wInfo[0],$wInfo[1],$alpha); break; } //If no save file name is given, the default is the original image name @unlink($source); //Save image 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() calls the image class, and then uses the following method to save images of different specifications and return the image connection
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//Get the image address of the corresponding specifications //gen=0: Keep the proportional scaling and do not crop. If the height is 0, the width is guaranteed to be scaled in proportion. gen=1: The length and width are guaranteed and cropped 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; } |
| 1 2 3 4 | //im: Save store images in 3 sizes: small image: 48x48, medium image 120x120, large image 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); |