php - Is it possible to count the number of keys in an array?

Question

I've googled this but found no answers, so I guess it's not possible. If there is a way, I'd love to know it. Thanks

with keys, do you mean only associative keys, e.g. those with a non-numeric index? For instance array('foo' => 'bar, 'baz') would return 1? Or you just want all keys? — Gordon
– Gordon, Commented Apr 27, 2010 at 12:11
google is your friend, but it'd better not be your only friend. When there is documentation available - and php has one of the best documentations I've ever read - use it. php.net/manual/en/ref.array.php — o0'.
– o0'., Commented Apr 27, 2010 at 12:11

Tom Haigh · Accepted Answer · 2016-12-27 19:25:42Z

16

The number of keys in the array will always be the number of elements in the array, as the keys must be unique. So:

$numKeys = count($array);

answered Apr 27, 2010 at 12:08

Tom Haigh

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Comments

ZZ Coder · Accepted Answer · 2010-04-27 12:08:59Z

13

count(array_keys($array));

answered Apr 27, 2010 at 12:08

ZZ Coder

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Sarfraz · Accepted Answer · 2010-04-27 12:09:05Z

4

Array is as long as its keys, you can use either of count or sizeof eg

echo count($your_array);

or

echo sizeof($your_array);

answered Apr 27, 2010 at 12:09

Sarfraz

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binaryLV · Accepted Answer · 2010-04-27 12:08:13Z

3

$array = array('one', 'two', 'three');
echo count($array);

answered Apr 27, 2010 at 12:08

binaryLV

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