PHP 5 Directory Functions (CodingTm.CoM)

The directory functions allow you to retrieve information about directories and their contents.

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Installation

The PHP directory functions are part of the PHP core. No installation is required to use these functions.

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PHP 5 Directory Functions

Function	Description
chdir()	Changes the current directory
chroot()	Changes the root directory
closedir()	Closes a directory handle
dir()	Returns an instance of the Directory class
getcwd()	Returns the current working directory
opendir()	Opens a directory handle
readdir()	Returns an entry from a directory handle
rewinddir()	Resets a directory handle
scandir()	Returns an array of files and directories of a specified directory

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PHP Error and Logging Functions (CodingTm.CoM)

The error and logging functions allows error handling and logging.
The error functions allow users to define error handling rules, and modify the way the errors can be logged.
The logging functions allow users to log applications and send log messages to email, system logs or other machines.

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Installation

The error and logging functions are part of the PHP core. There is no installation needed to use these functions.

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PHP Error and Logging Functions

PHP: indicates the earliest version of PHP that supports the function.

Function	Description	PHP
debug_backtrace()	Generates a backtrace	4
debug_print_backtrace()	Prints a backtrace	5
error_get_last()	Gets the last error occurred	5
error_log()	Sends an error to the server error-log, to a file or to a remote destination	4
error_reporting()	Specifies which errors are reported	4
restore_error_handler()	Restores the previous error handler	4
restore_exception_handler()	Restores the previous exception handler	5
set_error_handler()	Sets a user-defined function to handle errors	4
set_exception_handler()	Sets a user-defined function to handle exceptions	5
trigger_error()	Creates a user-defined error message	4
user_error()	Alias of trigger_error()	4

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PHP Error and Logging Constants

PHP: indicates the earliest version of PHP that supports the constant.

Value	Constant	Description	PHP
1	E_ERROR	Fatal run-time errors. Errors that cannot be recovered from. Execution of the script is halted
2	E_WARNING	Non-fatal run-time errors. Execution of the script is not halted
4	E_PARSE	Compile-time parse errors. Parse errors should only be generated by the parser
8	E_NOTICE	Run-time notices. The script found something that might be an error, but could also happen when running a script normally
16	E_CORE_ERROR	Fatal errors at PHP startup. This is like an E_ERROR in the PHP core	4
32	E_CORE_WARNING	Non-fatal errors at PHP startup. This is like an E_WARNING in the PHP core	4
64	E_COMPILE_ERROR	Fatal compile-time errors. This is like an E_ERROR generated by the Zend Scripting Engine	4
128	E_COMPILE_WARNING	Non-fatal compile-time errors. This is like an E_WARNING generated by the Zend Scripting Engine	4
256	E_USER_ERROR	Fatal user-generated error. This is like an E_ERROR set by the programmer using the PHP function trigger_error()	4
512	E_USER_WARNING	Non-fatal user-generated warning. This is like an E_WARNING set by the programmer using the PHP function trigger_error()	4
1024	E_USER_NOTICE	User-generated notice. This is like an E_NOTICE set by the programmer using the PHP function trigger_error()	4
2048	E_STRICT	Run-time notices. PHP suggest changes to your code to help interoperability and compatibility of the code	5
4096	E_RECOVERABLE_ERROR	Catchable fatal error. This is like an E_ERROR but can be caught by a user defined handle (see also set_error_handler())	5
6143	E_ALL	All errors and warnings, except of level E_STRICT	5

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PHP 5 Filesystem Functions (CodingTm.CoM)

The filesystem functions allow you to access and manipulate the filesystem.

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Installation

The filesystem functions are part of the PHP core. There is no installation needed to use these functions.

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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

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Unix / Windows Compatibility

When specifying a path on Unix platforms, the forward slash (/) is used as directory separator. However, on Windows platforms, both forward slash (/) and backslash (\) can be used.

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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

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PHP Filter Functions (CodingTm.CoM)

This PHP filters is used to validate and filter data coming from insecure sources, like user input.

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Installation

The filter functions are part of the PHP core. There is no installation needed to use these functions.

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PHP Filter Functions

PHP: indicates the earliest version of PHP that supports the function.

Function	Description	PHP
filter_has_var()	Checks if a variable of a specified input type exist	5
filter_id()	Returns the ID number of a specified filter	5
filter_input()	Get input from outside the script and filter it	5
filter_input_array()	Get multiple inputs from outside the script and filters them	5
filter_list()	Returns an array of all supported filters	5
filter_var_array()	Get multiple variables and filter them	5
filter_var()	Get a variable and filter it	5

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PHP Filters

ID Name	Description
FILTER_CALLBACK	Call a user-defined function to filter data
FILTER_SANITIZE_STRING	Strip tags, optionally strip or encode special characters
FILTER_SANITIZE_STRIPPED	Alias of "string" filter
FILTER_SANITIZE_ENCODED	URL-encode string, optionally strip or encode special characters
FILTER_SANITIZE_SPECIAL_CHARS	HTML-escape '"<>& and characters with ASCII value less than 32
FILTER_SANITIZE_EMAIL	Remove all characters, except letters, digits and !#$%&'*+-/=?^_`{|}~@.[]
FILTER_SANITIZE_URL	Remove all characters, except letters, digits and $-_.+!*'(),{}|\\^~[]`<>#%";/?:@&=
FILTER_SANITIZE_NUMBER_INT	Remove all characters, except digits and +-
FILTER_SANITIZE_NUMBER_FLOAT	Remove all characters, except digits, +- and optionally .,eE
FILTER_SANITIZE_MAGIC_QUOTES	Apply addslashes()
FILTER_UNSAFE_RAW	Do nothing, optionally strip or encode special characters
FILTER_VALIDATE_INT	Validate value as integer, optionally from the specified range
FILTER_VALIDATE_BOOLEAN	Return TRUE for "1", "true", "on" and "yes", FALSE for "0", "false", "off", "no", and "", NULL otherwise
FILTER_VALIDATE_FLOAT	Validate value as float
FILTER_VALIDATE_REGEXP	Validate value against regexp, a Perl-compatible regular expression
FILTER_VALIDATE_URL	Validate value as URL, optionally with required components
FILTER_VALIDATE_EMAIL	Validate value as e-mail
FILTER_VALIDATE_IP	Validate value as IP address, optionally only IPv4 or IPv6 or not from private or reserved ranges

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PHP FTP Functions (CodingTm.CoM)

The FTP functions give client access to file servers through the File Transfer Protocol (FTP).
The FTP functions are used to open, login and close connections, as well as upload, download, rename, delete, and get information on files from file servers. Not all of the FTP functions will work with every server or return the same results. The FTP functions became available with PHP 3.
These functions are meant for detailed access to an FTP server. If you only wish to read from or write to a file on an FTP server, consider using the ftp:// wrapper with the Filesystem functions.

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Installation

The windows version of PHP has built-in support for the FTP extension. So, the FTP functions will work automatically.
However, if you are running the Linux version of PHP, you will have to compile PHP with --enable-ftp (PHP 4+) or --with-ftp (PHP 3) to get the FTP functions to work.

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PHP FTP Functions

PHP: indicates the earliest version of PHP that supports the function.

Function	Description	PHP
ftp_alloc()	Allocates space for a file to be uploaded to the FTP server	5
ftp_cdup()	Changes the current directory to the parent directory on the FTP server	3
ftp_chdir()	Changes the current directory on the FTP server	3
ftp_chmod()	Sets permissions on a file via FTP	5
ftp_close()	Closes an FTP connection	4
ftp_connect()	Opens an FTP connection	3
ftp_delete()	Deletes a file on the FTP server	3
ftp_exec()	Executes a program/command on the FTP server	4
ftp_fget()	Downloads a file from the FTP server and saves it to an open file	3
ftp_fput()	Uploads from an open file and saves it to a file on the FTP server	3
ftp_get_option()	Returns runtime behaviors of the FTP connection	4
ftp_get()	Downloads a file from the FTP server	3
ftp_login()	Logs on to an FTP connection	3
ftp_mdtm()	Returns the last modified time of a specified file	3
ftp_mkdir()	Creates a new directory on the FTP server	3
ftp_nb_continue()	Continues retrieving/sending a file (non-blocking)	4
ftp_nb_fget()	Downloads a file from the FTP server and saves it to an open file (non-blocking)	4
ftp_nb_fput()	Uploads from an open file and saves it to a file on the FTP server (non-blocking)	4
ftp_nb_get()	Downloads a file from the FTP server (non-blocking)	4
ftp_nb_put()	Uploads a file to the FTP server (non-blocking)	4
ftp_nlist()	Lists the files in a specified directory on the FTP server	3
ftp_pasv()	Turns passive mode on or off	3
ftp_put()	Uploads a file to the FTP server	3
ftp_pwd()	Returns the current directory name	3
ftp_quit()	Alias of ftp_close()	3
ftp_raw()	Sends a raw command to the FTP server	5
ftp_rawlist()	Returns a detailed list of files in the specified directory	3
ftp_rename()	Renames a file or directory on the FTP server	3
ftp_rmdir()	Removes a directory on the FTP server	3
ftp_set_option()	Sets runtime options for the FTP connection	4
ftp_site()	Sends a SITE command to the server	3
ftp_size()	Returns the size of the specified file	3
ftp_ssl_connect()	Opens a secure SSL-FTP connection	4
ftp_systype()	Returns the system type identifier of the FTP server	3

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PHP FTP Constants

PHP: indicates the earliest version of PHP that supports the constant.

Constant	Description	PHP
FTP_ASCII		3
FTP_TEXT		3
FTP_BINARY		3
FTP_IMAGE		3
FTP_TIMEOUT_SEC		3
FTP_AUTOSEEK		4
FTP_AUTORESUME	Determine resume position and start position for get and put requests automatically	4
FTP_FAILED	Asynchronous transfer has failed	4
FTP_FINISHED	Asynchronous transfer has finished	4
FTP_MOREDATA	Asynchronous transfer is still active	4

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