How to implement watermark text and thumbnails in php

This article mainly introduces the method of implementing watermark text and thumbnails in PHP, and analyzes the relevant steps and operating techniques of adding watermark text and thumbnail generation in PHP in the form of a complete example. Friends in need can refer to the following

The details are as follows:

<?php
  $im = &#39;xiatian.jpg&#39;;
  $im2 = &#39;winter3.jpg&#39;;
  $img = getImage($im);
  $bimg = getImage($im2);
  //$image = getimagesize($im);
  //print_r($image);
  //Array ( [0] => 150 width
   /*[1] => 150 height
   [2] => 3 图片类型
   [3] => width="150" height="150"
   [bits] => 8
   [mime] => image/png )*/
  //图片复制组合------$bimg----
  imagecopy($bimg, $img, 300, 4, 0, 0, getWidth($im),getHeight($im));
  //加水印文字
  $color = imagecolorallocate($bimg,255, 255, 0);
  $str = "中国";
  $str = mb_convert_encoding($str, "html-entities","utf-8");
  imagettftext($bimg, 42, 0, rand(20,getWidth($im2)-100), rand(40,getHeight($im2)), $color, &#39;MSYH.TTF&#39;, $str);
  //剪切，重新生成缩略图
  $new = imagecreatetruecolor(50, 50);
  imagecopyresized($new, $bimg, 0, 0, 0, 0, 50, 50, getWidth($im2), getHeight($im2));
  //输出到浏览器
  header("Content-Type: image/jpeg");
  //如果为png图片也可正常显示，浏览器负责正确解析
  imagejpeg($new);
  //生成大图，小图
  imagejpeg($new,&#39;small.jpg&#39;);
  imagejpeg($bimg,&#39;big.jpg&#39;);
  function getImage($img_file) {
    $image = getimagesize($img_file);
    //判断是那种图片类型
    switch($image[2]) {
      case 1:
        $img = @imagecreatefromgif($img_file);
        break;
      case 2:
        $img = @imagecreatefromjpeg($img_file);
        break;
      case 3:
        $img = @imagecreatefrompng($img_file);
        break;
    }
    return $img;
  }
  function getWidth($img_file) {
    $image = getimagesize($img_file);
    return $image[0];
  }
  function getHeight($img_file) {
    $image = getimagesize($img_file);
    return $image[1];
  }
?>

The above is the entire content of this article, I hope it will be helpful to everyone's study.

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