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This article mainly shares with you the PHP code for equal-proportion processing of images, obtaining images of any size, stretching the missing parts, no deformation, and no blank spaces. I hope it can help everyone.
<? // 获得任意大小图像,不足地方拉伸,不产生变形,不留下空白 function my_image_resize($src_file, $dst_file , $new_width , $new_height) { $new_width= intval($new_width); $new_height=intval($new_width); if($new_width <1 || $new_height <1) { echo "params width or height error !"; exit(); } if(!file_exists($src_file)) { echo $src_file . " is not exists !"; exit(); } // 图像类型 $type=exif_imagetype($src_file); $support_type=array(IMAGETYPE_JPEG , IMAGETYPE_PNG , IMAGETYPE_GIF); if(!in_array($type, $support_type,true)) { echo "this type of image does not support! only support jpg , gif or png"; exit(); } //Load image switch($type) { case IMAGETYPE_JPEG : $src_img=imagecreatefromjpeg($src_file); break; case IMAGETYPE_PNG : $src_img=imagecreatefrompng($src_file); break; case IMAGETYPE_GIF : $src_img=imagecreatefromgif($src_file); break; default: echo "Load image error!"; exit(); } $w=imagesx($src_img); $h=imagesy($src_img); $ratio_w=1.0 * $new_width / $w;//源图像与目标图像宽的比 $ratio_h=1.0 * $new_height / $h; $ratio=1.0; // 生成的图像的高宽比原来的都小,或都大 ,原则是 取大比例放大,取大比例缩小(缩小的比例就比较小了) if( ($ratio_w < 1 && $ratio_h < 1) || ($ratio_w > 1 && $ratio_h > 1)) { if($ratio_w < $ratio_h) { $ratio = $ratio_h ; // 情况一,宽度的比例比高度方向的小,按照高度的比例标准来裁剪或放大 }else { $ratio = $ratio_w ; } // 定义一个中间的临时图像,该图像的宽高比 正好满足目标要求 $inter_w=(int)($new_width / $ratio); $inter_h=(int) ($new_height / $ratio); $inter_img=imagecreatetruecolor($inter_w , $inter_h); //var_dump($inter_img); imagecopy($inter_img, $src_img, 0,0,0,0,$inter_w,$inter_h); // 生成一个以最大边长度为大小的是目标图像$ratio比例的临时图像 // 定义一个新的图像 $new_img=imagecreatetruecolor($new_width,$new_height); //var_dump($new_img);exit(); imagecopyresampled($new_img,$inter_img,0,0,0,0,$new_width,$new_height,$inter_w,$inter_h); switch($type) { case IMAGETYPE_JPEG : imagejpeg($new_img, $dst_file,100); // 存储图像 break; case IMAGETYPE_PNG : imagepng($new_img,$dst_file,100); break; case IMAGETYPE_GIF : imagegif($new_img,$dst_file,100); break; default: break; } } else { // end if 1 目标图像 的一个边大于原图,一个边小于原图 ,先放大平普图像,然后裁剪 // =if( ($ratio_w < 1 && $ratio_h > 1) || ($ratio_w >1 && $ratio_h <1) ) $ratio=$ratio_h>$ratio_w? $ratio_h : $ratio_w; //取比例大的那个值 // 定义一个中间的大图像,该图像的高或宽和目标图像相等,然后对原图放大 $inter_w=(int)($w * $ratio); $inter_h=(int) ($h * $ratio); $inter_img=imagecreatetruecolor($inter_w , $inter_h); //将原图缩放比例后裁剪 imagecopyresampled($inter_img,$src_img,0,0,0,0,$inter_w,$inter_h,$w,$h); // 定义一个新的图像 $new_img=imagecreatetruecolor($new_width,$new_height); imagecopy($new_img, $inter_img, 0,0,0,0,$new_width,$new_height); switch($type) { case IMAGETYPE_JPEG : imagejpeg($new_img, $dst_file,100); // 存储图像 break; case IMAGETYPE_PNG : imagepng($new_img,$dst_file,100); break; case IMAGETYPE_GIF : imagegif($new_img,$dst_file,100); break; default: break; } }// if3}// end function my_image_resize('1.jpg','111.jpg','100px','100px'); ?>
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