Re: isset
| From: | Richard Lynch | Date: | Tue, 17 Apr 2007 22:43:13 +0000 |
| Subject: | Re: isset | ||
| References: | 1 2 3 4 5 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-253154@lists.php.net to get a copy of this message | ||
On Mon, April 16, 2007 8:06 pm, Robert Cummings wrote:
> On Mon, 2007-04-16 at 19:05 -0500, Richard Lynch wrote:
>> On Mon, April 16, 2007 6:10 pm, Jochem Maas wrote:
>> > if I know it's an array I'll definitely use empty() over count()
>> ....
>> > count() needs to actually count the items where as empty() can
>> return
>> > false
>> > as soon as it finds a singel element ... maybe I'm mistaken - if
>> so
>> > please
>> > put me right.
>>
>> You're wrong.
>>
>> The count is maintained internally as items are added/removed, and
>> it
>> is an O(1) operation for PHP to "count" the array, as it already
>> knows
>> the answer and just returns it.
>
> Fastest way to check if an array has elements...
>
> <?php
>
> if( $array )
> {
> }
>
> ?>
IIRC, in olden days of PHP 3.x, if the first element was '0' or 0,
then this test would result in FALSE...
Which is not to say it's "bad" now, but to explain why an old hand
might be leery of using it.
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