Руководство по PHP
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fopen

(PHP 3, PHP 4 )

fopen -- Opens file or URL

Description

resource fopen ( string filename, string mode [, int use_include_path [, resource zcontext]])

fopen() binds a named resource, specified by filename, to a stream. If filename is of the form "scheme://...", it is assumed to be a URL and PHP will search for a protocol handler (also known as a wrapper) for that scheme. If no wrappers for that protocol are registered, PHP will emit a notice to help you track potential problems in your script and then continue as though filename specifies a regular file.

If PHP has decided that filename specifies a local file, then it will try to open a stream on that file. The file must be accessible to PHP, so you need to ensure that the file access permissions allow this access. If you have enabled safe mode, or open_basedir further restrictions may apply.

If PHP has decided that filename specifies a registered protocol, and that protocol is registered as a network URL, PHP will check to make sure that allow_url_fopen is enabled. If it is switched off, PHP will emit a warning and the fopen call will fail.

Замечание: The list of supported protocols can be found in Прил. I. Some protocols (also referred to as wrappers) support context and/or php.ini options. Refer to the specific page for the protocol in use for a list of options which can be set. ( i.e. php.ini value user_agent used by the http wrapper) For a description of contexts and the zcontext parameter , refer to Ссылка XCVIII, Stream functions.

The mode parameter specifies the type of access you require to the stream. It may be any of the following:

Таблица 1. A list of possible modes for fopen() using mode

modeDescription
'r' Open for reading only; place the file pointer at the beginning of the file.
'r+' Open for reading and writing; place the file pointer at the beginning of the file.
'w' Open for writing only; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
'w+' Open for reading and writing; place the file pointer at the beginning of the file and truncate the file to zero length. If the file does not exist, attempt to create it.
'a' Open for writing only; place the file pointer at the end of the file. If the file does not exist, attempt to create it.
'a+' Open for reading and writing; place the file pointer at the end of the file. If the file does not exist, attempt to create it.

Замечание: The mode may contain the letter 'b'. This is useful only on systems which differentiate between binary and text files (i.e. Windows. It's useless on Unix). If not needed, this will be ignored. You are encouraged to include the 'b' flag in order to make your scripts more portable.

The optional third use_include_path parameter can be set to '1' or TRUE if you want to search for the file in the include_path, too.

If the open fails, the function returns FALSE.

Пример 1. fopen() examples

<?php
$handle = fopen ("/home/rasmus/file.txt", "r");
$handle = fopen ("/home/rasmus/file.gif", "wb");
$handle = fopen ("http://www.example.com/", "r");
$handle = fopen ("ftp://user:password@example.com/somefile.txt", "w");
?>

If you are experiencing problems with reading and writing to files and you're using the server module version of PHP, remember to make sure that the files and directories you're using are accessible to the server process.

On the Windows platform, be careful to escape any backslashes used in the path to the file, or use forward slashes. 

<?php
$handle = fopen ("c:\\data\\info.txt", "r");
?>

See also Прил. I, fclose(), fgets(), fsockopen(), file(), file_exists(), is_readable(), socket_set_timeout(), and popen().

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