[PHP] PHP 5.2 array() == null

2007-05-15 Thread [EMAIL PROTECTED] 

Hi people

i was just curios to ask whether

array() == null should always return true. and then why

i'm testing this with php 5.2.2

greetings

dominic letz

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RE: [PHP] PHP 5.2 array() == null

2007-05-15 Thread Edward Kay 

 -Original Message-
 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
 Sent: 15 May 2007 16:48
 To: php-general@lists.php.net
 Subject: [PHP] PHP 5.2 array() == null


 Hi people

 i was just curios to ask whether

 array() == null should always return true. and then why

 i'm testing this with php 5.2.2

 greetings

 dominic letz


According to Table Q.2 at
http://www.php.net/manual/en/types.comparisons.php, array() == NULL will
always return TRUE.

Remember == is a loose comparison. I think this is a result of the
following:

  array() == FALSE  is TRUE (because it's empty?)
FALSE == NULL   is TRUE
thus  array() == NULL   is TRUE

Edward

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RE: [PHP] PHP 5.2 array() == null

2007-05-15 Thread Robert Cummings 
On Tue, 2007-05-15 at 17:27 +0100, Edward Kay wrote:
  -Original Message-
  From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
  Sent: 15 May 2007 16:48
  To: php-general@lists.php.net
  Subject: [PHP] PHP 5.2 array() == null
 
 
  Hi people
 
  i was just curios to ask whether
 
  array() == null should always return true. and then why
 
  i'm testing this with php 5.2.2
 
  greetings
 
  dominic letz
 
 
 According to Table Q.2 at
 http://www.php.net/manual/en/types.comparisons.php, array() == NULL will
 always return TRUE.
 
 Remember == is a loose comparison. I think this is a result of the
 following:
 
   array() == FALSE  is TRUE (because it's empty?)

Yes, being empty is why it is equivalent to boolean false. It makes it
simple and self explanatory to do code like the following:

?php

if( $array )
{
// do something since it's not empty
}
else
{
// sorry nothing was found.
}

?

This is preferable to using the count() function since no function
overhead is incurred.

Cheers,
Rob.
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