Detailed explanation of php function for uploading image files

墨辰丷
Release: 2023-03-30 20:52:02
Original
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This article mainly introduces the detailed explanation of PHP's function for uploading image files. Interested friends can refer to it. I hope it will be helpful to everyone.

In PHP program development, file upload is a very commonly used function and is also one of the necessary skills for PHP programmers. Fortunately, implementing the file upload function in PHP is much simpler than in languages ​​such as Java and C#. Below we combine specific code examples to introduce in detail how to implement file upload and multi-file upload functions through PHP.

The code is very simple, we won’t talk too much here, just provide the source code

<?php
// 注册表单的姓名
$name="";
$nameErr="";
if ($_SERVER["REQUEST_METHOD"]=="POST") {
  if (empty($_POST[&#39;name&#39;])) {
  }else{
    $name=$_POST[&#39;name&#39;];
    if (!preg_match("/^[a-zA-Z]*$/", $name)) {
      $nameErr="只允许字母和空格";
    }else{
      echo &#39;姓名&#39;.$name;
    }
  }
 
  // 文件上传
    if ((($_FILES["file"]["type"] == "image/gif")
    || ($_FILES["file"]["type"] == "image/jpeg")
    || ($_FILES["file"]["type"] == "image/pjpeg"))
    && ($_FILES["file"]["size"] < 2000000))
    {
 
      if ($_FILES["file"]["error"]>0) {
        echo "错误:".$_FILES["file"]["error"]."<br/>";
 
      }else{
        echo "upload:".$_FILES["file"]["name"]."<br/>";
        echo "type:".$_FILES["file"]["type"]."<br/>";
        echo "size:".$_FILES["file"]["size"]."<br/>";
        echo "stored in:".$_FILES["file"]["tmp_name"];
      }  
    }else{
      if (file_exists("weiwei/".$_FILES["file"]["name"])) {
        echo $_FILES["file"]["name"]."上传成功.";
      }else{
         move_uploaded_file($_FILES["file"]["tmp_name"],
       "weiwei/" . $_FILES["file"]["name"]);
       echo "Stored in: " . "weiwei/" . $_FILES["file"]["name"];
      }
 
  echo "上传成功";
 
}
 
}
   
?>
 
<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>注册表单</title>
</head>
<body>
  <form action="" method="post" enctype="multipart/form-data">
  姓名:<input type="text" name="name" value="">
   <span class="error">* <?php echo $nameErr;?></span>
  文件类型:<input type="file" name="file" id="file">
  <img src="<?php echo "weiwei/".$_FILES[&#39;file&#39;][&#39;name&#39;]?>" alt="">
 
 
  <input type="submit" name="sub" value="提交">
  </form>
</body>
</html>
Copy after login

Summary: The above is the entire content of this article, I hope it can be helpful to everyone learning helps.

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