PHP中上传图片增加水印小案例

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1.文档目录如上图所示。

2.前台代码：’

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <title>Document</title>
</head>
<body>
<form name='frm' method='post' action='upload.php' enctype="multipart/form-data">
       <table width="50%" border="2" align="center" rules="all" cellpadding="10">
       <tr>
           <th colspan="2">请输入信息</th>
       </tr>
       <tr>
           <th>选择上传图片</th>
           <th><input type="file" name="upload"></input></th>
       </tr>
       <tr>
           <th colspan="2"><input type="submit" name="submit" value="提交"></input></th>
       </tr>
   </table>
   </form>
</body>
</html>

php代码：

<?php
header('content-type:text/html;charset=utf-8');
if (isset($_POST['submit'])) {
   //临时文件
   $filename = $_FILES['upload']['tmp_name'];
   //目标文件路径及文件名
   $path = './upload';
   @mkdir($path);
   $destination = $path.'/'.date('YmdHis').'.jpg';
   if(move_uploaded_file($filename, $destination)){

       //水印文字开始
       $image = imagecreatefromjpeg($destination);
       //第二步
       $color = imagecolorallocatealpha($image, 200, 100, 0,mt_rand(10,100)); //0-127
       $size = 30;
       $angle = 45;
       $x = 15;
       $y = 335;
       $fontfile = './sucai/hanyi.ttf';
       $string = '制作图像文字水印效果';

       imagettftext($image, $size, $angle, $x, $y, $color, $fontfile, $string);

       //第三步,输出
       imagejpeg($image,$destination);
       //第四步,销毁
       imagedestroy($image);
       //水印文字结束
       echo "上传成功";
   }else{
       echo "上传失败";
   }
} else {
   echo "<script>alert('nono');location.href='跳转页面'</script>";
}

?>

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