(PECL eio >= 0.0.1dev)
eio_readlink — Read value of a symbolic link
eio_readlink ( string $path , int $pri , callable $callback [, string $data = NULL ] ) : resource
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
.
eio_readlink() returns request resource on success or false
on error.
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"
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Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.eio-readlink.php