[PHP] Count empty array

2006-12-21 Thread Kevin Murphy 

I'm wondering why this is.

$data = ;
$array = explode(,,$data);
$count = count($array);
$count will = 1

$data = Test;
$array = explode(,,$data);
$count = count($array);
$count will = 1

$data = Test,Test;
$array = explode(,,$data);
$count = count($array);
$count will = 2

Why doesn't the first one give me an answer of 0 instead of 1. I know  
I could do a IF $data ==  [empty] and then not count if its empty  
and just set it to 0, but am wondering if there was a better way.



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Kevin Murphy
Webmaster: Information and Marketing Services
Western Nevada Community College
www.wncc.edu
775-445-3326

Re: [PHP] Count empty array

2006-12-21 Thread Robert Cummings 
On Thu, 2006-12-21 at 13:31 -0800, Kevin Murphy wrote:
 I'm wondering why this is.
 
 $data = ;
 $array = explode(,,$data);
 $count = count($array);
 $count will = 1
 
 $data = Test;
 $array = explode(,,$data);
 $count = count($array);
 $count will = 1
 
 $data = Test,Test;
 $array = explode(,,$data);
 $count = count($array);
 $count will = 2
 
 Why doesn't the first one give me an answer of 0 instead of 1.

For the same reason the second one gives you a count of one. There are
no commas and so only one item exists. Whether that be an string with
content or the empty string itself is irrelevant.

Cheers,
Rob.
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Re: [PHP] Count empty array

2006-12-21 Thread Jon Anderson 

Kevin Murphy wrote:

I'm wondering why this is.

$data = ;
$array = explode(,,$data);
$count = count($array);
$count will = 1

$data = Test;
$array = explode(,,$data);
$count = count($array);
$count will = 1

$data = Test,Test;
$array = explode(,,$data);
$count = count($array);
$count will = 2

Why doesn't the first one give me an answer of 0 instead of 1.

This:
   var_dump(explode(',',''));
Returns this:
   array(1) {
 [0]=
 string(0) 
   }

And oddly, This:
   var_dump(explode(',',NULL));
Returns this:
   array(1) {
 [0]=
 string(0) 
   }

That explains the count() result. It seems to me that the first case 
could go either way (The part of  before the ',' is still ), but I'm 
unable to think of a logical reason why the second doesn't return an 
empty array.
I know I could do a IF $data ==  [empty] and then not count if its 
empty and just set it to 0, but am wondering if there was a better way.
$array = empty($data) ? array() : explode(',',$data);  /* That what 
you're looking for? */


jon

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Re: [PHP] Count empty array

2006-12-21 Thread Martin Marques 

On Thu, 21 Dec 2006, Kevin Murphy wrote:


I'm wondering why this is.

$data = ;
$array = explode(,,$data);
$count = count($array);
$count will = 1


$array has 1 element: An empty string.


$data = Test;
$array = explode(,,$data);
$count = count($array);
$count will = 1


$array has 1 element: The string Test


$data = Test,Test;
$array = explode(,,$data);
$count = count($array);
$count will = 2


$array has 2 elements:.

Why doesn't the first one give me an answer of 0 instead of 1. I know I could 
do a IF $data ==  [empty] and then not count if its empty and just set it 
to 0, but am wondering if there was a better way.


Because explode divides the string in n+1 elements, where n is the amount 
of , (or your favorite delimiter) found in the string. So if no , is 
found, explode will return 1 element: the whole string (even if it's 
empty).


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Re: [PHP] Count empty array

2006-12-21 Thread tg-php 
Not sure why it does it, but doesn't seem to be a huge deal.  I'm guessing it's 
because an empty string is still a string. It's not null.

Anyway, it's documented at:

http://us3.php.net/manual/en/function.explode.php

A user writes:

If you split an empty string, you get back a one-element array with 0 as the 
key and an empty string for the value.

-TG

= = = Original message = = =

I'm wondering why this is.

$data = ;
$array = explode(,,$data);
$count = count($array);
$count will = 1

$data = Test;
$array = explode(,,$data);
$count = count($array);
$count will = 1

$data = Test,Test;
$array = explode(,,$data);
$count = count($array);
$count will = 2

Why doesn't the first one give me an answer of 0 instead of 1. I know  
I could do a IF $data ==  [empty] and then not count if its empty  
and just set it to 0, but am wondering if there was a better way.


-- 
Kevin Murphy
Webmaster: Information and Marketing Services
Western Nevada Community College
www.wncc.edu
775-445-3326


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