Backend Development
PHP Tutorial
Combining php and html to implement code for uploading image files to the server
Combining php and html to implement code for uploading image files to the server
The content of this article is about the code that combines php and html to upload image files to the server. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.
一.html code
<body> <form action="" method="post" enctype="multipart/form-data" name="upload_form"> <label>选择图片文件</label> <input name="imgfile" type="file" accept="image/gif, image/jpeg"/> <input name="upload" type="submit" value="上传" /> </form> </body>
二.php code
if (isset($_FILES['imgfile'])
&& is_uploaded_file($_FILES['imgfile']['tmp_name']))
{
$imgFile = $_FILES['imgfile'];
$upErr = $imgFile['error'];
if ($upErr == 0)
{
$imgType = $imgFile['type']; //文件类型。
/* 判断文件类型，这个例子里仅支持jpg和gif类型的图片文件。*/
if ($imgType == 'image/jpeg'
|| $imgType == 'image/gif')
{
$imgFileName = $imgFile['name'];
$imgSize = $imgFile['size'];
$imgTmpFile = $imgFile['tmp_name'];
/*
将文件从临时文件夹移到上传文件夹中。
注意：upfile这个文件夹必须先创建好，不然会报错。
*/
move_uploaded_file($imgTmpFile, 'upfile/'.$imgFileName);
/*显示上传后的文件的信息。*/
$strPrompt = sprintf("文件%s上传成功<br>"
. "文件大小: %s字节<br>"
. "<img src='upfile/%s'>"
, $imgFileName, $imgSize, $imgFileName
);
echo $strPrompt;
}
else
{
echo "请选择jpg或gif文件，不支持其它类型的文件。";
}
}
else
{
echo "文件上传失败。<br>";
switch ($upErr)
{
case 1:
echo "超过了php.ini中设置的上传文件大小。";
break;
case 2:
echo "超过了MAX_FILE_SIZE选项指定的文件大小。";
break;
case 3:
echo "文件只有部分被上传。";
break;
case 4:
echo "文件未被上传。";
break;
case 5:
echo "上传文件大小为0";
break;
}
}
}
else
{
}三.php code analysis:
$_FILES is an array variable used to save uploaded file information.
$_FILES['imgfile'] indicates the information of the file uploaded after the control with the file domain name 'imgfile' is submitted to the server.
An uploaded file has the following attribute information:
'name': The name of the uploaded file on the client.
'type': The MIME type of the file, such as "image/jpeg".
'size': The size of the uploaded file, in bytes.
'tmp_name': When uploading, the uploaded file will be saved in a temporary folder on the server side. You can get the temporary file name through this attribute.
'error': Error code during file upload. If the upload is successful, this value is 0. The meanings of other values are as follows:
1: Exceeds the upload file size set in php.ini.
2: The file size specified by the MAX_FILE_SIZE option is exceeded.
3: Only part of the file was uploaded.
4: The file was not uploaded.
5: The uploaded file size is 0.
The code first determines whether the $_FILES['imgfile'] variable exists. If it exists, and the file pointed to by the $_FILES['imgfile']['tmp_name'] variable is uploaded , determine the error attribute. If the attribute is 0, move the uploaded image from the temporary folder to the upfile folder, display the uploaded file information, and display the uploaded image.
If the error value is not 0, it means the upload failed and the failure message is displayed.
4. Complete code
上传图片文件 " . "文件大小: %s字节
" . "" , $imgFileName, $imgSize, $imgFileName ); echo $strPrompt; } else { echo "请选择jpg或gif文件，不支持其它类型的文件。"; } } else { echo "文件上传失败。
"; switch ($upErr) { case 1: echo "超过了php.ini中设置的上传文件大小。"; break; case 2: echo "超过了MAX_FILE_SIZE选项指定的文件大小。"; break; case 3: echo "文件只有部分被上传。"; break; case 4: echo "文件未被上传。"; break; case 5: echo "上传文件大小为0"; break; } } } else { /*显示表单。*/ ?> <body> <form action="" method="post" enctype="multipart/form-data" name="upload_form"> <label>选择图片文件</label> <input name="imgfile" type="file" accept="image/gif, image/jpeg"/> <input name="upload" type="submit" value="上传" /> </form> </body>
Recommended related articles:
What are php type constraints? Introduction and usage of php type constraints
The above is the detailed content of Combining php and html to implement code for uploading image files to the server. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
Alipay PHP SDK transfer error: How to solve the problem of 'Cannot declare class SignData'?
Apr 01, 2025 am 07:21 AM
Alipay PHP...
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
How does session hijacking work and how can you mitigate it in PHP?
Apr 06, 2025 am 12:02 AM
Session hijacking can be achieved through the following steps: 1. Obtain the session ID, 2. Use the session ID, 3. Keep the session active. The methods to prevent session hijacking in PHP include: 1. Use the session_regenerate_id() function to regenerate the session ID, 2. Store session data through the database, 3. Ensure that all session data is transmitted through HTTPS.
Describe the SOLID principles and how they apply to PHP development.
Apr 03, 2025 am 12:04 AM
The application of SOLID principle in PHP development includes: 1. Single responsibility principle (SRP): Each class is responsible for only one function. 2. Open and close principle (OCP): Changes are achieved through extension rather than modification. 3. Lisch's Substitution Principle (LSP): Subclasses can replace base classes without affecting program accuracy. 4. Interface isolation principle (ISP): Use fine-grained interfaces to avoid dependencies and unused methods. 5. Dependency inversion principle (DIP): High and low-level modules rely on abstraction and are implemented through dependency injection.
How to debug CLI mode in PHPStorm?
Apr 01, 2025 pm 02:57 PM
How to debug CLI mode in PHPStorm? When developing with PHPStorm, sometimes we need to debug PHP in command line interface (CLI) mode...
Framework Security Features: Protecting against vulnerabilities.
Mar 28, 2025 pm 05:11 PM
Article discusses essential security features in frameworks to protect against vulnerabilities, including input validation, authentication, and regular updates.
How to automatically set permissions of unixsocket after system restart?
Mar 31, 2025 pm 11:54 PM
How to automatically set the permissions of unixsocket after the system restarts. Every time the system restarts, we need to execute the following command to modify the permissions of unixsocket: sudo...
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
