If you plan to use your wrapper in a require_once you need to define stream_stat(). If you plan to allow any other tests like is_file()/is_dir(), you have to define url_stat().
stream_stat() must define the size of the file, or it will never be included. url_stat() must define mode, or is_file()/is_dir()/is_executable(), and any of those functions affected by clearstatcache() simply won't work.
It's not documented, but directories must be a mode like 040777 (octal), and files a mode like 0100666. If you wish the file to be executable, use 7s instead of 6s. The last 3 digits are exactly the same thing as what you pass to chmod. 040000 defines a directory, and 0100000 defines a file. It would be really helpful to add this to the official manual!stream_wrapper_register
(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)
stream_wrapper_register — Register a URL wrapper implemented as a PHP class
Description
Allows you to implement your own protocol handlers and streams for use with all the other filesystem functions (such as fopen(), fread() etc.).
Parameters
protocol-
The wrapper name to be registered. Valid protocol names must contain alphanumerics, dots (.), plusses (+), or hyphens (-) only.
class-
The classname which implements the
protocol. flags-
Should be set to
STREAM_IS_URLifprotocolis a URL protocol. Default is 0, local stream.
Return Values
Returns true on success or false on failure.
stream_wrapper_register() will return false if the
protocol already has a handler.
Examples
Example #1 How to register a stream wrapper
<?php
$existed = in_array("var", stream_get_wrappers());
if ($existed) {
stream_wrapper_unregister("var");
}
stream_wrapper_register("var", "VariableStream");
$myvar = "";
$fp = fopen("var://myvar", "r+");
fwrite($fp, "line1\n");
fwrite($fp, "line2\n");
fwrite($fp, "line3\n");
rewind($fp);
while (!feof($fp)) {
echo fgets($fp);
}
fclose($fp);
var_dump($myvar);
if ($existed) {
stream_wrapper_restore("var");
}
?>The above example will output:
line1 line2 line3 string(18) "line1 line2 line3 "
See Also
- The streamWrapper prototype class
- Example class registered as stream wrapper
- stream_wrapper_unregister() - Unregister a URL wrapper
- stream_wrapper_restore() - Restores a previously unregistered built-in wrapper
- stream_get_wrappers() - Retrieve list of registered streams
＋add a note
User Contributed Notes 2 notes
cellog at php dot net ¶
21 years ago
jhannus at php dot net ¶
21 years ago
It is worth noting that if your wrapper supports stream_flush() then when you flcose() your stream this function will be called prior to closing the stream.