php將圖片保存為不同尺寸圖片的圖片類實例

 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,並封裝成一個類文件以便於調用,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：

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 <?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) || 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; $this->error_code = 0; return true; } } /** * 保存文件 * @return bool */ function save() { if(empty($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; } /** * 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, $type) = !empty($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; } /** * 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 = $basefilename[0]; if(empty($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); //如果圖片小於水印圖片，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(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()調用圖片類,然後再用下面的方法保存不同規格的圖片並返回圖片連接

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 //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:

? 1 2 3 4 //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。