学步园

■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_writable to check whether the file can be written to

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

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

■filesize to check the file’s size

获取文件大小 php

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

$modified = date("D d M g:i:s", filemtime($file));<br /> $accessed = date("D d M g:i:s", fileatime($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<br /> $location = './';<br /> $dp = opendir($location);<br /> while ($entry = readdir($dp) )<br /> {<br /> if (is_dir($location . $entry))<br /> {<br /> echo '[Dir] ' . $entry . '<br />';<br /> }<br /> else if (is_file($location . $entry))<br /> {<br /> echo '[File] ' . $entry . '<br />';<br /> }<br /> }<br /> closedir($dp); 

2.dir — directory 类

    dir::dir ( string $directory )

    string $path ;

resource $handle ;

string read ( void )

void rewind ( void )

void close ( void )

eg:

$location = './';<br /> $dir = dir($location);<br /> while ( $entry = $dir->read() )<br /> {<br /> if (is_dir($location . $entry))<br /> {<br /> echo '[Dir] ' . $entry . '<br />';<br /> }<br /> else if (is_file($location . $entry))<br /> {<br /> echo '[File] ' . $entry . '<br />';<br /> }<br /> }<br /> echo "Handle: " . $dir->handle . "<br />";<br /> echo "Path: " . $dir->path . "<br />";<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<br /> // Specify a file to download<br /> $fileName = 'example.ini';<br /> $mimeType = 'application/zip';<br /> if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE 5') or strpos($_SERVER['HTTP_USER_AGENT'], 'Opera 7'))<br /> {<br /> $mimeType = 'application/x-download';<br /> }<br /> header('Content-Disposition: attachment; filename=' . $fileName);<br /> header('Content-Type: ' . $mimeType);<br /> header('Content-Length: ' . filesize($fileName));<br /> readfile($fileName);<br /> ?>