目录

PHP 文件系统函数


PHP文件系统简介

文件系统函数允许您访问和操作文件系统。


安装

文件系统函数是 PHP 核心的一部分。使用这些功能无需安装。


Unix / Windows 兼容性

在 Unix 平台上指定路径时,使用正斜杠 (/) 作为目录分隔符。

在 Windows 平台上,可以使用正斜杠 (/) 和反斜杠 (\)。


运行时配置

文件系统函数的行为受 php.ini 中的设置影响。

Name Default Description Changeable
allow_url_fopen "1" Allows fopen()-type functions to work with URLs PHP_INI_SYSTEM
allow_url_include "0" (available since PHP 5.2) 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 email address to be used on unauthenticated FTP connections and in the From header for HTTP connections when using ftp and http wrappers 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
sys_temp_dir "" (available since PHP 5.5) PHP_INI_SYSTEM


PHP 文件系统函数

Function Description
basename() Returns the filename component of a path
chgrp() Changes the file group
chmod() Changes the file mode
chown() Changes the file owner
clearstatcache() Clears the file status cache
copy() Copies a file
delete() See unlink()
dirname() Returns the directory name component of a path
disk_free_space() Returns the free space of a filesystem or disk
disk_total_space() Returns the total size of a filesystem or disk
diskfreespace() Alias of disk_free_space()
fclose() Closes an open file
feof() Checks if the "end-of-file" (EOF) has been reached for an open file
fflush() Flushes buffered output to an open file
fgetc() Returns a single character from an open file
fgetcsv() Returns a line from an open CSV file
fgets() Returns a line from an open file
fgetss() Deprecated from PHP 7.3. Returns a line from an open file - stripped from HTML and PHP tags
file() Reads a file into an array
file_exists() Checks whether or not a file or directory exists
file_get_contents() Reads a file into a string
file_put_contents() Writes data to a file
fileatime() Returns the last access time of a file
filectime() Returns the last change time of a file
filegroup() Returns the group ID of a file
fileinode() Returns the inode number of a file
filemtime() Returns the last modification time of a file
fileowner() Returns the user ID (owner) of a file
fileperms() Returns the file's permissions
filesize() Returns the file size
filetype() Returns the file type
flock() Locks or releases a file
fnmatch() Matches a filename or string against a specified pattern
fopen() Opens a file or URL
fpassthru() Reads from the current position in a file - until EOF, and writes the result to the output buffer
fputcsv() Formats a line as CSV and writes it to an open file
fputs() Alias of fwrite()
fread() Reads from an open file (binary-safe)
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 (binary-safe)
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 writable
is_writeable() Alias of is_writable()
lchgrp() Changes the group ownership of a symbolic link
lchown() Changes the user ownership of a symbolic link
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() Alias of stream_set_write_buffer(). Sets the buffer size for write operations on the given 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