


PHP performs related operations on folders (traversing, calculating size), _PHP tutorial
PHP performs related operations on folders (traversing, calculating size),
shares the first operation content with you: Traverse and print all files in the specified directory
<?php //功能:遍历并打印指定目录下所有文件 function scan_dir($dir_name,$dir_flag=1) { static $FILE_COUNT=1; //记录文件数目 初值为1 目录名称不记 $FILE_COUNT--; //每调用一次scan_dir()函数自减1 @$dir_handle=opendir($dir_name); //抑制错误信息显示 便于自定义错误显示 if(!$dir_handle) die("目录打开错误!"); while(false!==($filename=readdir($dir_handle))) //文件名为‘0'时,readdir返回 FALSE,判断返回值是否不全等 { $flag=$dir_flag; //古怪的 is_dir($filename) ! $filename这个路径必须能够寻到!当$filename不存在或者不是目录时返回false if($filename!='.'&&$filename!='..') { $FILE_COUNT++; //不记录当前路径和上一级路径 while($flag>0&&--$flag) //负数仍为真 echo ' '; if(is_dir($dir_name.$filename)) //判断 是否为一个目录 { echo '<strong>'."<a href=".$dir_name.$filename.">".$filename."</a></strong><br>"; scan_dir($dir_name.$filename.'/',$dir_flag+1); //$dir_flag标志目录树层次 } else { echo "<a href=".$dir_name.$filename.">".$filename."</a><br>"; } } } closedir($dir_handle); //关闭目录句柄 echo "文件总数:".$FILE_COUNT.'<br>'; } scan_dir('D:/AppServ/www/mytest/shopping/payment/'); /*总结: 1,关于路径 目录的路径末尾都加上 '/' 以便后面与文件名字符串连接 形成新的 路径字符串 2,目录遍历 这是一个关于树的问题 3,is_dir()函数第一个参数必须是一个能够识别的PATH否则会因目录不存在而返回一个false容易误解 得出 “这不是一个目录”的错误结论 形成逻辑上的错误 4,注意当前路径'.'和上一级路径'..'的剔除 否则 在递归环节造成死循环 直至内存耗尽出错。 5,dir_flag这个变量是记录树的深度 以便于目录分级分层输出 */ /*不足 1,输出排版不完善 2,逻辑与表示层混乱 不分明 大忌! 3,面向过程 */
#####Single Directory#####
// 列出目录内容 $dir 不要加 '/' function list_files($dir) { if(is_dir($dir)) { if($handle = opendir($dir)) { while(($file = readdir($handle)) !== false) { if($file != "." && $file != ".." && $file != "Thumbs.db") { echo '<a href="'.$dir.'/'.$file.'">'.$file.'</a><br>'."\n"; } } closedir($handle); } } } list_files('D:/AppServ/www/mytest/shopping/payment');
The second operation content of PHP on files: Get the folder size and calculate the file
<?php function getDirSize($dir) { $handle = opendir($dir); while (false!==($FolderOrFile = readdir($handle))) { if($FolderOrFile != "." && $FolderOrFile != "..") { if(is_dir("$dir/$FolderOrFile")) { $sizeResult += getDirSize("$dir/$FolderOrFile"); } else { $sizeResult += filesize("$dir/$FolderOrFile"); } } } closedir($handle); return $sizeResult; } //单位自动转换函数 function getRealSize($size) { $kb = 1024; //Kilobyte $mb = 1024 * $kb; //Megabyte $gb = 1024 * $mb; //Gigabyte $tb = 1024 * $gb; //Terabyte if($size < $kb) { return $size." B"; } else if($size < $mb) { return round($size/$kb,2)." KB"; } else if($size < $gb) { return round($size/$mb,2)." MB"; } else if($size < $tb) { return round($size/$gb,2)." GB"; } else { return round($size/$tb,2)." TB"; } } echo getRealSize(getDirSize('D:/AppServ/www/mytest/')); // get byte function dirsize($dir) { $handle=opendir($dir); $size = 0; while ( $file=readdir($handle) ) { if ( ( $file == "." ) || ( $file == ".." ) ) continue; if ( is_dir("$dir/$file") ) $size += dirsize("$dir/$file"); else $size += filesize("$dir/$file"); } closedir($handle); return $size; } $big=dirsize(dirname($_SERVER['SCRIPT_FILENAME'])."/"); echo '('.$big.' bytes)';
The above is about the basic operations of PHP on folders. I hope it will be helpful to everyone's learning.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

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 originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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

MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.

Dreamweaver Mac version
Visual web development tools

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 Mac version
God-level code editing software (SublimeText3)

ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment