文件系统函数允许您访问和操作文件系统。
文件系统函数是 PHP 核心的一部分。使用这些功能无需安装。
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 (\)。
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 |
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 |
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