Simple file upload to local file for PHP development (2)

In the previous section, we explained how to use the <form> form to upload files, and created an HTML form page

and provided some restrictions on uploading files.

In this section we use PHP code to perform if judgments on various conditions

First we must determine the value passing method:

<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
}
 //$_SERVER['REQUEST_METHOD']提交表单的方式，这里用POST提交。
?>

Judge whether the image exists in the directory:

<?php
if (!is_uploaded_file($_FILES["upfile"]["tmp_name"]))
  //判断是否存在文件
{
  echo "图片不存在!";
  exit;
}
?>

$_FILES["upfile"]["tmp_name"] is the original path name of the image.

Determine the size of the uploaded file:

<?
$file = $_FILES["upfile"];
if($max_file_size < $file["size"])
  //检查文件大小
{
  echo "文件太大!";
  exit;
}
?>

$_FILES["upfile"]["size"] is the size of the uploaded file, expressed here in bytes.

Determine whether there are files with the same name in the same directory:

<?php
if(!file_exists($destination_folder)) //file_exists() 函数检查文件或目录是否存在。
{
  mkdir($destination_folder);  //mkdir() 函数创建目录。
}

$filename = $file["tmp_name"];
$image_size = getimagesize($filename);
$pinfo = pathinfo($file["name"]); //pathinfo() 函数以数组或字符串的形式返回关于文件路径的信息。
$ftype = $pinfo['extension'];  //"extension"在PHP.INI文件里面 因为我们要用到GD库
$destination = $destination_folder.time().".".$ftype;

if (file_exists($destination) && $overwrite != true)  //判断是否存在同名文件
{
  echo "同名文件已经存在了";
  exit;
}
?>

Here we add a section to determine whether to add a watermark for everyone’s benefit Study reference.

<?php

if($watermark==1) //是否添加水印
{
  $iinfo=getimagesize($destination,$iinfo);
  $nimage=imagecreatetruecolor($image_size[0],$image_size[1]);
  $white=imagecolorallocate($nimage,255,255,255);
  $black=imagecolorallocate($nimage,0,0,0);
  $red=imagecolorallocate($nimage,255,0,0);
  imagefill($nimage,0,0,$white);
  
  switch ($iinfo[2])
  {
    case 1:
      $simage =imagecreatefromgif($destination);
      break;
    case 2:
      $simage =imagecreatefromjpeg($destination);
      break;
    case 3:
      $simage =imagecreatefrompng($destination);
      break;
    case 6:
      $simage =imagecreatefromwbmp($destination);
      break;
    default:
      die("不支持的文件类型");
      exit;
  }
  imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]);
  imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white);
  
  switch($watertype)
  {
    case 1:   //加水印字符串
      imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);
      break;
    case 2:   //加水印图片
      $simage1 =imagecreatefromgif("xplore.gif");
      imagecopy($nimage,$simage1,0,0,0,0,85,15);
      imagedestroy($simage1);
      break;
  }
  switch ($iinfo[2])
  {
    case 1:
      //imagegif($nimage, $destination);
      imagejpeg($nimage, $destination);
      break;
    case 2:
      imagejpeg($nimage, $destination);
      break;
    case 3:
      imagepng($nimage, $destination);
      break;
    case 6:
      imagewbmp($nimage, $destination);
      //imagejpeg($nimage, $destination);
      break;
  }
  //覆盖原上传文件
  imagedestroy($nimage);
  imagedestroy($simage);
}
?>

Complete example code:

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php

//上传文件类型列表
$uptypes=array(
  'image/jpg',
  'image/jpeg',
  'image/png',
  'image/gif',
  'image/bmp',
);

$max_file_size=2000000;     //上传文件大小限制, 单位BYTE
$destination_folder="uploadimg/"; //上传文件路径，默认本地路径
$watermark=1;      //是否附加水印(1为加水印,其他为不加水印);
$watertype=1;      //水印类型(1为文字,2为图片)
$waterposition=1;     //水印位置(1为左下角,2为右下角,3为左上角,4为右上角,5为居中);
$waterstring = "";  //水印字符串
$waterimg="";    //水印图片
$imgpreview=1;      //是否生成预览图(1为生成,其他为不生成);
$imgpreviewsize=1/2;    //缩略图比例
?>
<html>
<head>
  <meta charset="utf-8">
  <title>图片上传</title>
  <style type="text/css">
    <!--
    body
    {
      font-size: 16px;
    }
    input
    {
      background-color: #66CCFF;
      border: 1px inset #CCCCCC;
    }
    -->
  </style>
</head>
<body>
<form enctype="multipart/form-data" method="post" name="upform">
  上传文件:
  <input name="upfile" type="file">
  <input type="submit" value="上传"><br>
  允许上传的文件类型为:<?php echo implode(', ',$uptypes);?>
</form>
<?php
if ($_SERVER['REQUEST_METHOD'] == 'POST')  //$_SERVER['REQUEST_METHOD']提交表单的方式，这里用POST提交。
{
  if (!is_uploaded_file($_FILES["upfile"]["tmp_name"]))
    //判断是否存在文件
  {
    echo "图片不存在!";
    exit;
  }
  $file = $_FILES["upfile"];
  if($max_file_size < $file["size"])
    //检查文件大小
  {
    echo "文件太大!";
    exit;
  }
  if(!in_array($file["type"], $uptypes))
    //检查文件类型
  {
    echo "文件类型不符!".$file["type"];
    exit;
  }
  if(!file_exists($destination_folder)) //file_exists() 函数检查文件或目录是否存在。
  {
    mkdir($destination_folder);  //mkdir() 函数创建目录。
  }
  $filename = $file["tmp_name"];
  $image_size = getimagesize($filename);
  $pinfo = pathinfo($file["name"]); //pathinfo() 函数以数组或字符串的形式返回关于文件路径的信息。
  $ftype = $pinfo['extension'];  //"extension"在PHP.INI文件里面 因为我们要用到GD库
  $destination = $destination_folder.time().".".$ftype;
  if (file_exists($destination) && $overwrite != true)  //判断是否存在同名文件
  {
    echo "同名文件已经存在了";
    exit;
  }
  if(!move_uploaded_file ($filename, $destination))
  {
    echo "移动文件出错";
    exit;
  }
  $pinfo = pathinfo($destination);
  $fname = $pinfo["basename"];
  echo " <font color=red>已经成功上传</font><br>文件名:  <font color=blue>".$destination_folder.$fname."</font><br>";
  echo " 宽度:".$image_size[0];
  echo " 长度:".$image_size[1];
  echo "<br> 大小:".$file["size"]." bytes";
  if($watermark==1) //是否添加水印
  {
    $iinfo=getimagesize($destination,$iinfo);
    $nimage=imagecreatetruecolor($image_size[0],$image_size[1]);
    $white=imagecolorallocate($nimage,255,255,255);
    $black=imagecolorallocate($nimage,0,0,0);
    $red=imagecolorallocate($nimage,255,0,0);
    imagefill($nimage,0,0,$white);
    switch ($iinfo[2])
    {
      case 1:
        $simage =imagecreatefromgif($destination);
        break;
      case 2:
        $simage =imagecreatefromjpeg($destination);
        break;
      case 3:
        $simage =imagecreatefrompng($destination);
        break;
      case 6:
        $simage =imagecreatefromwbmp($destination);
        break;
      default:
        die("不支持的文件类型");
        exit;
    }
    imagecopy($nimage,$simage,0,0,0,0,$image_size[0],$image_size[1]);
    imagefilledrectangle($nimage,1,$image_size[1]-15,80,$image_size[1],$white);
    switch($watertype)
    {
      case 1:   //加水印字符串
        imagestring($nimage,2,3,$image_size[1]-15,$waterstring,$black);
        break;
      case 2:   //加水印图片
        $simage1 =imagecreatefromgif("xplore.gif");
        imagecopy($nimage,$simage1,0,0,0,0,85,15);
        imagedestroy($simage1);
        break;
    }
    switch ($iinfo[2])
    {
      case 1:
        //imagegif($nimage, $destination);
        imagejpeg($nimage, $destination);
        break;
      case 2:
        imagejpeg($nimage, $destination);
        break;
      case 3:
        imagepng($nimage, $destination);
        break;
      case 6:
        imagewbmp($nimage, $destination);
        //imagejpeg($nimage, $destination);
        break;
    }
    //覆盖原上传文件
    imagedestroy($nimage);
    imagedestroy($simage);
  }
  if($imgpreview==1)  //是否预览图片
  {
    echo "<br>图片预览:<br>";
    echo "<img src=\"".$destination."\" width=".($image_size[0]*$imgpreviewsize)." height=".($image_size[1]*$imgpreviewsize);
    echo " alt=\"图片预览:\r文件名:".$destination."\r上传时间:\">";
  }
}
?>
</body>
</html>

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