PHP method to generate thumbnails in original proportion_php skills

The example in this article describes the method of generating thumbnails in original proportion in PHP. Share it with everyone for your reference, the details are as follows:

<&#63;php
$image = "jiequ.jpg"; // 原图
$imgstream = file_get_contents($image);
$im = imagecreatefromstring($imgstream);
$x = imagesx($im);//获取图片的宽
$y = imagesy($im);//获取图片的高
// 缩略后的大小
$xx = 140;
$yy = 200;
if($x>$y){
//图片宽大于高
  $sx = abs(($y-$x)/2);
  $sy = 0;
  $thumbw = $y;
  $thumbh = $y;
} else {
//图片高大于等于宽
  $sy = abs(($x-$y)/2.5);
  $sx = 0;
  $thumbw = $x;
  $thumbh = $x;
 }
if(function_exists("imagecreatetruecolor")) {
 $dim = imagecreatetruecolor($yy, $xx); // 创建目标图gd2
} else {
 $dim = imagecreate($yy, $xx); // 创建目标图gd1
}
imageCopyreSampled ($dim,$im,0,0,$sx,$sy,$yy,$xx,$thumbw,$thumbh);
header ("Content-type: image/jpeg");
imagejpeg ($dim, false, 100);
&#63;>

Readers who are interested in more PHP-related content can check out the special topics on this site: "Summary of PHP graphics and image manipulation skills", "Introduction to PHP basic syntax tutorial" and " Summary of common PHP functions and techniques》

I hope this article will be helpful to everyone in PHP programming.