Home php教程 php手册 php创建临时文件tempnam与tmpfile区别

php创建临时文件tempnam与tmpfile区别

Jun 13, 2016 am 09:54 AM
php tempnam tmpfile and function create the difference only document file name

tempnam() 函数创建一个具有唯一文件名的临时文件。 若成功,则该函数返回新的临时文件名。若失败,则返回 false。

tempnam() 函数创建一个具有唯一文件名的临时文件。

若成功,则该函数返回新的临时文件名。若失败,则返回 false。

语法
tempnam(dir,prefix)


*/
function dir_wriable($dir)         //自定义函数扩展建立临时文件
{
  $test=tempnam("$dir","test_file");       //建立临时文件
  if(fopen($test,"w">$fp=@fopen($test,"w"))        //如果文件成功打开
  {
    @fclose($fp);          //关闭文件
    @unlink($test);          //删除文件
    $wriable="ture";          //返回值为真
  }
  else
  {
    $wriable=false or die("cannot open $test!");    //返回值为假
  }
  return $wriable;          //返回布尔型值
}
if(dir_wriable(str_replace('//','/',dirname(__file__))))    //调用自定义函数
{
  $dir_wriable='建立文件成功';
}
else
{
  $dir_wriable='建立文件失败';
}

/*
如果 php教程 不能在指定的 dir 参数中创建文件,则退回到系统默认值。

注释:本函数的行为在 4.0.3 版中改变了。也会建立一个临时文件以避免竞争情形,即有可能会在产生出作为文件名的字符串与脚本真正建立该文件之间会在文件系统中存在同名文件。注意,如果不再需要该文件则要删除此文件,不会自动删除的。

tmpfile() 函数以读写(w+)模式建立一个具有唯一文件名的临时文件。

文件会在关闭后(用 fclose())自动被删除,或当脚本结束后。


*/

$temp = tmpfile();

fwrite($temp, "testing, testing.");

//倒回文件的开头
rewind($temp);

//从文件中读取 1k
echo fread($temp,1024);

//删除文件
fclose($temp);

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

PHP and Python: Comparing Two Popular Programming Languages 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: A Key Language for Web Development 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

The Future of PHP: Adaptations and Innovations The Future of PHP: Adaptations and Innovations Apr 11, 2025 am 12:01 AM

The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.

PHP vs. Python: Understanding the Differences 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 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.

PHP's Purpose: Building Dynamic Websites PHP's Purpose: Building Dynamic Websites Apr 15, 2025 am 12:18 AM

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP's Current Status: A Look at Web Development Trends PHP's Current Status: A Look at Web Development Trends Apr 13, 2025 am 12:20 AM

PHP remains important in modern web development, especially in content management and e-commerce platforms. 1) PHP has a rich ecosystem and strong framework support, such as Laravel and Symfony. 2) Performance optimization can be achieved through OPcache and Nginx. 3) PHP8.0 introduces JIT compiler to improve performance. 4) Cloud-native applications are deployed through Docker and Kubernetes to improve flexibility and scalability.

PHP vs. Other Languages: A Comparison 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.

See all articles