PHP 文件操作

■file_exists, to check whether the file exists

■is_file, to check the file is indeed a file and not a directory

■is_readable, to check whether the file can be read

■is_writableto check whether the file can be written to

■filemtimeto check the date and time at which the file the file was last modified

■fileatimeto find the date and time the file at which was last accessed

■filesizeto check the file’s size

获取文件大小 php

<?php print_r( fileSizeUnit('writeSecureScripts.txt') ); // Function to convert a size to bytes to large units function fileSizeUnit($file) { $size = filesize($file); if ($size >= 1073741824) { $size = number_format(($size / 1073741824), 2); $unit = 'GB'; } else if ($size >= 1048576) { $size = number_format(($size / 1048576), 2); $unit = 'MB'; } else if ($size >= 1024) { $size = number_format(($size / 1024), 2); $unit = 'KB'; } else if ($size >= 0) { $unit = 'B'; } else { $size = '0'; $unit = 'B'; } return array('size' => $size, 'unit' => $unit); }

$modified = date("D d M g:i:s", filemtime($file)); $accessed = date("D d M g:i:s", fileatime($file));

1.file() 把整个文件读入一个数组中,数组中的每个单元都是文件中相应的一行，包括换行符在内

eg: file('http://www.dianzhui.net/index.html')

2.file_get_contents() 将整个文件读入一个字符串

3.readfile() 读入一个文件并写入到输出缓冲

4.fopen('file','rb'); fread($fp,filesize('file')); feof($fp)测试文件指针是否到了文件结束的位置 fgetc($fg)从文件指针中读取字符 fgets($handle[,int $length ])从文件指针中读取一行

fopen ( string $filename , string $mode [, bool $use_include_path [, resource $zcontext ]] )打开文件或者 URL

fread( int $handle , int $length ) 读取文件（可安全用于二进制文件）

PHP检测目录

1. opendir() readdir() rewinddir() closedir()

opendir( string $path [, resource $context ] ) 打开目录句柄

readdir( resource $dir_handle ) 从目录句柄中读取条目

closedir()

rewinddir() — 倒回目录句柄

eg:

<?php $location = './'; $dp = opendir($location); while ($entry = readdir($dp) ) { if (is_dir($location . $entry)) { echo '[Dir] ' . $entry . '<br />'; } else if (is_file($location . $entry)) { echo '[File] ' . $entry . '<br />'; } } closedir($dp);

2.dir — directory 类

dir::dir ( string $directory )

string $path ;

resource $handle ;

string read ( void )

void rewind ( void )

void close ( void )

eg:

$location = './'; $dir = dir($location); while ( $entry = $dir->read() ) { if (is_dir($location . $entry)) { echo '[Dir] ' . $entry . '<br />'; } else if (is_file($location . $entry)) { echo '[File] ' . $entry . '<br />'; } } echo "Handle: " . $dir->handle . "<br />"; echo "Path: " . $dir->path . "<br />"; $dir->close();

PHP显示屏和平代码

highlight_file ( string $filename [, bool $return = false ] ) 当bool 为true 时，返回字符串，并不是显示

highlight_string(string $str [, bool $return = false ] ) 当bool 为true 时，返回字符串，并不是显示

parse_ini_file( string $filename [, bool $process_sections ] ) — 解析一个配置文件

php管理文件下载 『通过特殊的HTTP头和readfile函数』

创建ZIP/TAR文件 用 『pear』类 Archive_Tar

参考：

http://pear.php.net/package/Archive_Tar/docs/latest/Archive_Tar/Archive_Tar.html

http://pear.php.net/package/Archive_Tar/download/1.3.7/

eg：

<?php // Specify a file to download $fileName = 'example.ini'; $mimeType = 'application/zip'; if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE 5') or strpos($_SERVER['HTTP_USER_AGENT'], 'Opera 7')) { $mimeType = 'application/x-download'; } header('Content-Disposition: attachment; filename=' . $fileName); header('Content-Type: ' . $mimeType); header('Content-Length: ' . filesize($fileName)); readfile($fileName); ?>