本文实例讲述了php文件操作相关类。分享给大家供大家参考。具体如下:
<?php class file_dir { function check_exist($filename) //检查目录或文件是否存在 { if(file_exists($filename)) { return true; } else return false; } function create_dir($dirname,$mode=0777) // 一次只能创建一级目录 { if(is_null($dirname) || $dirname=="") return false; if(!is_dir($dirname)) { return mkdir($dirname,$mode); } } function createDir($aimUrl) //可同时创建多级目录 { $aimUrl = str_replace('\\', '/', $aimUrl); $aimDir = ''; $arr = explode('/', $aimUrl); foreach ($arr as $str) { $aimDir .= $str . '/'; if (!file_exists($aimDir)) { mkdir($aimDir); } } } function delete_dir($dirname) //删除目录 { if($this->check_exist($dirname) and is_dir($dirname)) { if(!$dirhandle=opendir($dirname)) return false; while(($file=readdir($dirhandle))!==false) { if($file=="." or $file=="..") continue; $file=$dirname.DIRECTORY_SEPARATOR.$file; //表示$file是$dir的子目录 if(is_dir($file)) { $this->delete_dir($file); } else { unlink($file); } } closedir($dirhandle); return rmdir($dirname); } else return false; } function copy_dir($dirfrom,$dirto) //复制目录 { if(!is_dir($dirfrom)) return false; if(!is_dir($dirto)) mkdir($dirto); $dirhandle=opendir($dirfrom); if($dirhandle) { while(false!==($file=readdir($dirhandle))) { if($file=="." or $file=="..") continue; $filefrom=$dirfrom.DIRECTORY_SEPARATOR.$file; //表示$file是$dir的子目录 $fileto=$dirto.DIRECTORY_SEPARATOR.$file; if(is_dir($filefrom)) { $this->copy_dir($filefrom,$fileto); } else { if(!file_exists($fileto)) copy($filefrom,$fileto); } } } closedir($dirhandle); } function getdir_size($dirname) //获取目录大小 { if(!file_exists($dirname) or !is_dir($dirname)) return false; if(!$handle=opendir($dirname)) return false; $size=0; while(false!==($file=readdir($handle))) { if($file=="." or $file=="..") continue; $file=$dirname."/".$file; if(is_dir($file)) { $size+=$this->getdir_size($file); } else { $size+=filesize($file); } } closedir($handle); return $size; } function getReal_size($size) // 单位自动转换函数 { $kb=1024; $mb=$kb*1024; $gb=$mb*1024; $tb=$gb*1024; if($size<$kb) return $size."B"; if($size>=$kb and $size<$mb) return round($size/$kb,2)."KB"; if($size>=$mb and $size<$gb) return round($size/$mb,2)."MB"; if($size>=$gb and $size<$tb) return round($size/$gb,2)."GB"; if($size>=$tb) return round($size/$tb,2)."TB"; } function copy_file($srcfile,$dstfile) { if(is_file($srcfile)) { if(!file_exists($dstfile)) return copy($srcfile,$dstfile); } else return false; } function unlink_file($filename) //删除文件 { if($this->check_exist($filename) and is_file($filename)) { return unlink($filename); } else return false; } function getsuffix($filename) //获取文件名后缀 { if(file_exists($filename) and is_file($filename)) { return end(explode(".",$filename)); } } function input_content($filename,$str) //将字符串写入文件 { if(function_exists(file_put_contents)) { file_put_contents($filename,$str); } else { $fp=fopen($filename,"wb"); fwrite($fp,$str); fclose($fp); } } function output_content($filename) //将整个文件内容读出到一个字符串中 { if(function_exists(file_get_contents)) { return file_get_contents($filename); } else { $fp=fopen($filename,"rb"); $str=fread($fp,filesize($filename)); fclose($fp); return $str; } } function output_to_array($filename) //将文件内容读出到一个数组中 { $file=file($filename); $arr=array(); foreach($file as $value) { $arr[]=trim($value); } return $arr; } } //$dir=new file_dir; //$size=$dir->getdir_size("F:/wamp/www/class/images"); //echo $dir->getReal_size($size); ?>
希望本文所述对大家的php程序设计有所帮助。

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.

Fibers was introduced in PHP8.1, improving concurrent processing capabilities. 1) Fibers is a lightweight concurrency model similar to coroutines. 2) They allow developers to manually control the execution flow of tasks and are suitable for handling I/O-intensive tasks. 3) Using Fibers can write more efficient and responsive code.

The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.

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 is not dying, but constantly adapting and evolving. 1) PHP has undergone multiple version iterations since 1994 to adapt to new technology trends. 2) It is currently widely used in e-commerce, content management systems and other fields. 3) PHP8 introduces JIT compiler and other functions to improve performance and modernization. 4) Use OPcache and follow PSR-12 standards to optimize performance and code quality.

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.


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