PHP implements image cropping and watermark effect code, _PHP tutorial

PHP implements image cropping and watermark effect code,

3. Image cropping with PHP

 <div>
    <h4>裁剪之前</h4>
    <img src="1.png" style="border:1px solid red;">
  </div>
  <&#63;php
  header("content-type","text/html;charset=utf-8");
   
  /*
  *图片裁剪
  *@param string $filename  图片的url
  *@param int  $width   图片裁剪宽度
  *@param int  $height   图片裁剪高度
  *@param int  $x     裁剪图片左边开始的位置
  *@param int  $y     裁剪图片顶边开始的位置
  */
  function cut($filename,$x,$y,$width,$height)
  {
    /*获取图像资源，需要裁剪的图片*/
    $image = imagecreatefrompng($filename);
  
    /*以新的大小创建画布，保存裁剪后的图片*/
    $image_p = imagecreatetruecolor($width, $height);
  
    /*使用imagecopyresampled缩放*/
    imagecopyresampled($image_p, $image, 0, 0, $x, $y, $width, $height, $width, $height);
  
    /*保存裁剪后的图片和命名*/
    imagepng($image_p,'test1.png');
  
    /*释放资源*/
    imagedestroy($image_p);
    imagedestroy($image);
  }
  /*调用函数*/
  cut('1.png',20,20,80,80);      
  &#63;>
  <div>
    <h4>裁剪之后</h4>
    <img src="test1.png" style="border:1px solid red;">
  </div>

Effect

4. Add watermark to images with PHP

 <div>
    <h4>没有水印</h4>
    <img src="1.png" style="border:1px solid red;">
  </div>
  <&#63;php
  header("content-type","text/html;charset=utf-8");
   
  /*
  *给背景图片添加水印,背景图片格式png,水印格式gif
  *@param string $filename  图片的url
  *@param string $water   水印图片
  */
  function watermark($filename,$water)
  {
    /*获取原图的大小*/
    list($b_w,$b_h) = getimagesize($filename);
  
    /*获取水印图片的大小*/
    list($w_w,$w_h) = getimagesize($water);
  
    /*在背景图片中放水印图片的随机起始位置*/
    $posX =rand(0,($b_w - $w_w));
    $posY =rand(0,($b_h - $w_h));
  
    /*获取图像资源，需要裁剪的图片*/
    $back = imagecreatefrompng($filename);
    $water = imagecreatefromgif($water);
  
    /*使用Inagecopy函数复制水印图片到指定位置*/
    imagecopy($back, $water, $posX, $posY, 0, 0, $w_w, $w_h);
  
    /*保存带水印的图片和命名*/
    imagepng($back,'test2.png');
  
    /*释放资源*/
    imagedestroy($back);
    imagedestroy($water);
  }
  /*调用函数*/
  watermark('1.png','test.gif');      
  &#63;>
  <div>
    <h4>加上水印</h4>
    <img src="test2.png" style="border:1px solid red;">
  </div>

Effect

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