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Php 上载图像时文件中未定义索引

php validation file-upload

Php 上载图像时文件中未定义索引,php,validation,file-upload,image-uploading,Php,Validation,File Upload,Image Uploading,我正在尝试创建一个用户可以上传图像的表单。我正在使用php验证这个文件，看看它是否是一个图像文件，但我得到了一个错误 “未定义的索引文件..” 我不明白怎么了。。请帮忙 HTML代码 <html> <body> <form action="upload.php" method="post" enctype="multipart/form-data"> <input type="file" name="photo" id="file" /> &l

我正在尝试创建一个用户可以上传图像的表单。我正在使用php验证这个文件，看看它是否是一个图像文件，但我得到了一个错误

“未定义的索引文件..”

我不明白怎么了。。请帮忙

HTML代码

<html>
<body>

<form action="upload.php" method="post" enctype="multipart/form-data">
<input type="file" name="photo" id="file" /> 
<input type="submit" name="submit" value="Submit" />
</form>
</body>
</html>
PHP代码

  <?php
  if ((($_FILES["photo"]["type"] == "image/gif")
  || ($_FILES["photo"]["type"] == "image/jpeg")
  || ($_FILES["photo"]["type"] == "image/png"))
  && ($_FILES["photo"]["size"] < 1000000))
  {
  if ($_FILES["photo"]["error"] > 0)
  {
  echo "Return Code: " . $_FILES["photo"]["error"] . " ";
  }
  else
  {
  echo "Upload: " . $_FILES["photo"]["name"] . "";
  echo "Type: " . $_FILES["photo"]["type"] . "";
  echo "Size: " . ($_FILES["photo"]["size"] / 1024) . " Kb";
  echo "Temp file: " . $_FILES["photo"]["tmp_name"] . "";

  if (file_exists("users/" . $_FILES["photo"]["name"]))
  {
  echo $_FILES["photo"]["name"] . " already exists. ";
  }
  else
  {
  move_uploaded_file($_FILES["photo"]["tmp… "users/" . $_FILES["photo"]["name"]);
  echo "Stored in: " . "users/" . $_FILES["photo"]["name"];
  }
  }
  else
  {
  echo "Invalid file";
  }
  ?>

处理程序有两个问题。

1） 上一个
else
条件上方缺少右括号

2） 以下行包含不属于的字符（tmp…
中的点）：

move_uploaded_file($_FILES["photo"]["tmp… "users/" . $_FILES["photo"]["name"]);
更改为：

move_uploaded_file($_FILES["photo"]["tmp_name"], "users/" . $_FILES["photo"]["name"]);
重新格式化的代码，已测试 
使用isset（$_FILES[“photo”]）。哪一行有此错误？if语句中的条件…@Muhammad Zeeshan我应该在哪里使用u提到的代码？？？可能重复

<?php
  if ((($_FILES["photo"]["type"] == "image/gif")
  || ($_FILES["photo"]["type"] == "image/jpeg")
  || ($_FILES["photo"]["type"] == "image/png"))
  && ($_FILES["photo"]["size"] < 1000000))
  {
  if ($_FILES["photo"]["error"] > 0)
  {
  echo "Return Code: " . $_FILES["photo"]["error"] . " ";
  }
  else
  {
    echo "Upload: " . $_FILES["photo"]["name"] . "";
    echo "<br>";
    echo "Type: " . $_FILES["photo"]["type"] . "";
    echo "<br>";
    echo "Size: " . ($_FILES["photo"]["size"] / 1024) . " Kb";
    echo "<br>";
    echo "Temp file: " . $_FILES["photo"]["tmp_name"] . "";
    echo "<br>";

  if (file_exists("users/" . $_FILES["photo"]["name"]))
  {
  echo $_FILES["photo"]["name"] . " already exists. ";
  }
  else
  {

// error line for you to compare the error
// move_uploaded_file($_FILES["photo"]["tmp… "users/" . $_FILES["photo"]["name"]);

move_uploaded_file($_FILES["photo"]["tmp_name"], "users/" . $_FILES["photo"]["name"]);

  echo "Stored in: " . "users/" . $_FILES["photo"]["name"];
  }
  }
  } // this was the missing closing brace
  else
  {
  echo "Invalid file";
  }

?>