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# MongoCursor::tailable

(PECL mongo >=0.9.4)

MongoCursor::tailable — Sets whether this cursor will be left open after fetching the last results

### Opis

public MongoCursor MongoCursor::tailable ([ boolean `$tail` = true ] )

Mongo has a feature known as tailable cursors which are similar to the Unix "tail -f" command.

Tailable means cursor is not closed when the last data is retrieved. rather, the cursor marks the final object's position. you can resume using the cursor later, from where it was located, if more data were received.

Like any "latent cursor", the cursor may become invalid at some point -- for example if that final object it references were deleted. Thus, you should be prepared to requery if the cursor is dead().

### Parametry

`tail`

  If the cursor should be tailable.

### Zwracane wartości

Returns this cursor.

### Błędy/Wyjątki

Throws MongoCursorException if this cursor has started iterating.

### Przykłady

Przykład #1 MongoCursor::tailable() example

`<?php
$cursor = $collection->find()->tailable();
$results = array();
while (1) {
if (!$cursor->hasNext()) {
// we've read all the results, exit
if ($cursor->dead()) {
break;
}
// read all results so far, wait for more
sleep(10);
}
else {
$results[] = $cursor->getNext();
}
}
?>`

MongoCursor::sort
MongoCursor::valid
MongoCursor
PHP Manual