Php/docs/function.eio-readlink

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• Read value of a symbolic link

eio_readlink

(PECL eio >= 0.0.1dev)

eio_readlink — Read value of a symbolic link

Description

eio_readlink ( string $path , int $pri , callable $callback [, string $data = NULL ] ) : resource

Parameters

path

Source symbolic link path

pri

The request priority: EIO_PRI_DEFAULT, EIO_PRI_MIN, EIO_PRI_MAX, or NULL. If NULL passed, pri internally is set to EIO_PRI_DEFAULT.

callback

callback function is called when the request is done. It should match the following prototype:

void callback(mixed $data, int $result[, resource $req]);

data

is custom data passed to the request.

result

request-specific result value; basically, the value returned by corresponding system call.

req

is optional request resource which can be used with functions like eio_get_last_error()

data

Arbitrary variable passed to callback.

Return Values

eio_readlink() returns request resource on success or FALSE on error.

Examples

Example #1 eio_readlink() example

<?php$filename = dirname(__FILE__)."/symlink.dat";touch($filename);$link = dirname(__FILE__)."/symlink.link";$hardlink = dirname(__FILE__)."/hardlink.link";function my_hardlink_cb($data, $result) {    global $link, $filename;    var_dump(file_exists($data) && !is_link($data));    @unlink($data);    eio_symlink($filename, $link, EIO_PRI_DEFAULT, "my_symlink_cb", $link);}function my_symlink_cb($data, $result) {    global $link, $filename;    var_dump(file_exists($data) && is_link($data));    if (!eio_readlink($data, EIO_PRI_DEFAULT, "my_readlink_cb", NULL)) {        @unlink($link);        @unlink($filename);    }}function my_readlink_cb($data, $result) {    global $filename, $link;    var_dump($result);    @unlink($link);    @unlink($filename);}eio_link($filename, $hardlink, EIO_PRI_DEFAULT, "my_hardlink_cb", $hardlink);eio_event_loop();?>

The above example will output something similar to:

bool(true)
bool(true)
string(16) "/tmp/symlink.dat"

See Also

• eio_symlink() - Create a symbolic link