Detailed explanation of php function for uploading image files-PHP Tutorial-php.cn

Detailed explanation of php function for uploading image files

墨辰丷

Release： 2023-03-30 20:52:02

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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>

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