Initialize an inotify instance

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- PHP Manual
- Inotify Functions
- Initialize an inotify instance

# inotify_init

(PECL inotify >= 0.1.2)

inotify_init — Initialize an inotify instance

### Description

inotify_init(): resource

Initialize an inotify instance for use with inotify_add_watch()

### Parameters

This function has no parameters.

### Return Values

A stream resource or `false` on error.

### Examples

Example #1 Example usage of inotify

    <?php// Open an inotify instance$fd = inotify_init();// Watch __FILE__ for metadata changes (e.g. mtime)$watch_descriptor = inotify_add_watch($fd, __FILE__, IN_ATTRIB);// generate an eventtouch(__FILE__);// Read events$events = inotify_read($fd);print_r($events);// The following methods allows to use inotify functions without blocking on inotify_read():// - Using stream_select() on $fd:$read = array($fd);$write = null;$except = null;stream_select($read,$write,$except,0);// - Using stream_set_blocking() on $fdstream_set_blocking($fd, 0);inotify_read($fd); // Does no block, and return false if no events are pending// - Using inotify_queue_len() to check if event queue is not empty$queue_len = inotify_queue_len($fd); // If > 0, inotify_read() will not block// Stop watching __FILE__ for metadata changesinotify_rm_watch($fd, $watch_descriptor);// Close the inotify instance// This may have closed all watches if this was not already donefclose($fd);?>

The above example will output something similar to:

    array(
      array(
        'wd' => 1,     // Equals $watch_descriptor
        'mask' => 4,   // IN_ATTRIB bit is set
        'cookie' => 0, // unique id to connect related events (e.g.
                       // IN_MOVE_FROM and IN_MOVE_TO events)
        'name' => '',  // the name of a file (e.g. if we monitored changes
                       // in a directory)
      ),
    );

### See Also

- inotify_add_watch() - Add a watch to an initialized inotify instance
- inotify_rm_watch() - Remove an existing watch from an inotify instance
- inotify_queue_len() - Return a number upper than zero if there are pending events
- inotify_read() - Read events from an inotify instance
- fclose() - Closes an open file pointer