PHP 5 Filesystem Functions
PHP Filesystem Introduction
Installation
The filesystem functions are part of the PHP core. There is no installation needed to use these functions.
Unix / Windows Compatibility
When specifying a path on Unix platforms, a forward slash (/) is used as directory separator.
On Windows platforms, both forward slash (/) and backslash (\) can be used.
Runtime Configuration
The behavior of the filesystem functions is affected by settings in php.ini.
Filesystem configuration options:
| 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 |
PHP 5 Filesystem Functions
| 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() or unset() |
| dirname() | Returns the directory name component of a path |
| disk_free_space() | Returns the free space of a directory |
| disk_total_space() | Returns the total size of a directory |
| diskfreespace() | Alias of disk_free_space() |
| fclose() | Closes an open file |
| feof() | Tests for end-of-file on an open file |
| fflush() | Flushes buffered output to an open file |
| fgetc() | Returns a character from an open file |
| fgetcsv() | Parses a line from an open file, checking for CSV fields |
| fgets() | Returns a line from an open file |
| fgetss() | Returns a line, with HTML and PHP tags removed, from an open file |
| 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 a string 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 permissions of a file |
| 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 an open 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 |
| 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 |
Credit: www.w3schools.com
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