php 的檔案處理系統

php 的檔案處理系統

執行階段的設定

php的檔案處理函數皆會受到 php.ini 裡面的設定選項影響。所以，要先了解有哪些設定：

Name	Default	Description	Changeable
allow_url_fopen	"1"	Allows fopen()-type functions to work with URLs (available since PHP 4.0.4)	PHP_INI_SYSTEM
user_agent	NULL	Defines the user agent for PHP to send (available since PHP 4.3)	PHP_INI_ALL
default_socket_timeout	"60"	Sets the default timeout, in seconds, for socket based streams (available since PHP 4.3)	PHP_INI_ALL
from	""	Defines the anonymous FTP password (your email address)	PHP_INI_ALL
auto_detect_line_endings	"0"	When set to "1", PHP will examine the data read by fgets() and file() to see if it is using Unix, MS-Dos or Mac line-ending characters (available since PHP 4.3)	PHP_INI_ALL

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路徑 "/" "\"  的相容性 Unix / Windows Compatibility

Unix的路徑使用 (/)，而Windows則是(/)(\)  都可以。

PHP 5  的檔案系統函數

函數 Function	敘述
basename()	傳回一個路徑的 檔案名稱 部分
chgrp()	改變檔案所屬的 群組 group
chmod()	改變檔案 模式 mode
chown()	改變檔案擁有者 file owner
clearstatcache()	清除檔案狀態快取 file status cache
copy()	複製一個檔案
delete()	請閱  unlink() 或 unset()
dirname()	傳回一個路徑的目錄部分 Returns the directory name component of a path
disk_free_space()	傳回一個目錄的自由可用空間 Returns the free space of a directory
disk_total_space()	傳回一目錄的總共空間 Returns the total size of a directory
diskfreespace()	跟 disk_free_space() 一樣的。別名而已。
fclose()	關閉一個開啟的檔案
feof()	測試一個開啟檔案的 end-of-file
fflush()	Flushes buffered output to an open file
fgetc()	傳回開啟檔案的一個字元 Returns a character from an open file
fgetcsv()	傳回開啟檔案的一行，CSV格式 Parses a line from an open file, checking for CSV fields
fgets()	傳回開啟檔案的一行 Returns a line from an open file
fgetss()	傳回開啟檔案的一行，移除HTML, PHP的標籤 Returns a line, with HTML and PHP tags removed, from an open file
file()	讀取檔案到一個陣列中 Reads a file into an array
file_exists()	檢查檔案或目錄是否存在 Checks whether or not a file or directory exists
file_get_contents()	讀取檔案進入一個字串變數 Reads a file into a string
file_put_contents()	將一個字串變數寫入檔案 Writes a string to a file
fileatime()	傳回檔案最後一次存取的時間 Returns the last access time of a file
filectime()	傳回檔案最後一次改變的時間 Returns the last change time of a file
filegroup()	傳回檔案的 群組 ID Returns the group ID of a file
fileinode()	傳回檔案的 inode 號碼 Returns the inode number of a file
filemtime()	傳回檔案最後修改的時間 Returns the last modification time of a file
fileowner()	傳回檔案擁有者的 user ID Returns the user ID (owner) of a file
fileperms()	傳回檔案的權限資料 Returns the permissions of a file
filesize()	傳回檔案大小 Returns the file size
filetype()	傳回檔案格式 Returns the file type
flock()	鎖定或釋放檔案 Locks or releases a file
fnmatch()	比對 檔案名稱或字串 Matches a filename or string against a specified pattern
fopen()	開啟檔案 Opens a file or URL
fpassthru()	讀取一個開啟的檔案，直到EOF，然後將結果寫到output buffer Reads from an open file, until EOF, and writes the result to the output buffer
fputcsv()	將一行格式成CSV，然後寫到開啟的檔案 Formats a line as CSV and writes it to an open file
fputs()	跟 fwrite()一樣 Alias of fwrite()
fread()	從開啟的檔案讀取 Reads from an open file
fscanf()	Parses input from an open file according to a specified format
fseek()	Seeks in an open file
fstat()	Returns information about an open file
ftell()	Returns the current position in an open file
ftruncate()	Truncates an open file to a specified length
fwrite()	Writes to an open file
glob()	Returns an array of filenames / directories matching a specified pattern
is_dir()	Checks whether a file is a directory
is_executable()	Checks whether a file is executable
is_file()	Checks whether a file is a regular file
is_link()	Checks whether a file is a link
is_readable()	Checks whether a file is readable
is_uploaded_file()	Checks whether a file was uploaded via HTTP POST
is_writable()	Checks whether a file is writeable
is_writeable()	Alias of is_writable()
lchgrp()	Changes group ownership of symlink
lchown()	Changes user ownership of symlink
link()	Creates a hard link
linkinfo()	Returns information about a hard link
lstat()	Returns information about a file or symbolic link
mkdir()	Creates a directory
move_uploaded_file()	Moves an uploaded file to a new location
parse_ini_file()	Parses a configuration file
parse_ini_string()	Parses a configuration string
pathinfo()	Returns information about a file path
pclose()	Closes a pipe opened by popen()
popen()	Opens a pipe
readfile()	Reads a file and writes it to the output buffer
readlink()	Returns the target of a symbolic link
realpath()	Returns the absolute pathname
realpath_cache_get()	Returns realpath cache entries
realpath_cache_size()	Returns realpath cache size
rename()	Renames a file or directory
rewind()	Rewinds a file pointer
rmdir()	Removes an empty directory
set_file_buffer()	Sets the buffer size of an open file
stat()	Returns information about a file
symlink()	Creates a symbolic link
tempnam()	Creates a unique temporary file
tmpfile()	Creates a unique temporary file
touch()	Sets access and modification time of a file
umask()	Changes file permissions for files
unlink()	Deletes a file

完整的刪除一個目錄：

function delTree($dir) {  

1.     $files = glob( $dir . '*', GLOB_MARK );  
2.     foreach( $files as $file ){  
3.         if( substr( $file, -1 ) == '/' )  
4.             delTree( $file );  
5.         else  
6.             unlink( $file );  
7.     }   
8.   
9.     if (is_dir($dir)) rmdir( $dir );   
10.   
11. }