Backend Development
PHP Tutorial
PHP file upload-detailed explanation of the use of move_uploaded_file() function
PHP file upload-detailed explanation of the use of move_uploaded_file() function
Uploading files is a very common function in PHP development, and it is also very common in daily development. It is much simpler to implement the file upload function in PHP than in other languages. This section introduces the file upload function. and multiple file uploads!
Then in the previous article "php file upload - configure php.inn file and predefined variables $_FILES" we introduced that file upload needs to configure the php.ini file. This is The necessary steps for file uploading and the introduction of predefined variables. Friends who have not yet read it can read it in detail. It will be helpful to read the following article.
File upload function
The move_uploaded_file() function is used in PHP to upload files. The syntax format of this function is as follows:
bool move_uploaded_file ( string $filename , string $destination )
move_uploaded_file() function stores the uploaded file to the specified location. If successful, it will return true, otherwise it will return false. The parameter filename is the temporary file name of the uploaded file, which is $S_FILES[tem_name]; the parameter destination is the new path and name saved after uploading.
This kind of check is particularly important if the uploaded file may cause its content to be displayed to the user or other users of this system.
Note:
move_uploaded_file() is sensitive to both safe mode and open_basedir. However, the restrictions are only for destination paths, as filename filenames allowed for mobile uploads may conflict with these restrictions. move_uploaded_file() only works on files uploaded via PHP to ensure the safety of this operation.
The following example creates an upload form that allows uploading files with a file size of less than 1MB. The specific sample code is as follows:
<html>
<body>
<!--上传表单，有一个上传文件域-->
<form method="post" action="" enctype="multipart/form-data" name="form">
<input type="file" name="up_file">
<!-- 提交按钮-->
<input type="submit" name="submit" value="上传">
</form>
</body>
</html>
<?php
header("Content-Type:text/html; charset=utf-8");
if(!empty($_FILES['up_file']['name'])){ //判断是否有文件
$fileinfo = $_FILES['up_file']; //将文件信息赋给变量$fileinfo
if($fileinfo['size']<1000000 && $fileinfo['size']>0){ //判断文件大小
move_uploaded_file($fileinfo['tmp_name'],$fileinfo['name']); //上传文件
echo "上传成功";
}else{
echo '文件太大或未知';
}
}
?>Select a file to upload, the output result is as follows:
Instructions:
Use The move_uploaded_file() function uploads files. When creating a form, you must set the form form's enctype="multipart/form-data".
We have introduced the upload file function here. In the next article, we will introduce multiple file uploads. For details, please read "PHP File Upload-Detailed Explanation of Sample Code for Multiple File Uploads 》!
The above is the detailed content of PHP file upload-detailed explanation of the use of move_uploaded_file() function. 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
1668
14
1427
52
1329
25
1273
29
1256
24
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
PHP vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.
