[PHP] empty function and array indices
Hello!
Suppose I have the following code:
$a = array('a'=1, 'b'=2);
echo empty($a['c'])?'empty':'not empty';
echo $a['c'];
Why doesn't the 2nd line output a warning when error_reporting is set
to E_ALL? Is empty() some kind of special function where the validity
of indices is not checked? If that is the case, I have two questions:
1. Will this behavior persist in future versions of PHP?
2. Are there other functions or a general rule where PHP doesn't
output warnings when a nonexistant index is given?
--
Immanuel doesn't pun, he Kant.
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Re: [PHP] empty function and array indices
Gabriel Birke wrote:
Hello!
Suppose I have the following code:
$a = array('a'=1, 'b'=2);
echo empty($a['c'])?'empty':'not empty';
echo $a['c'];
Why doesn't the 2nd line output a warning when error_reporting is set
to E_ALL? Is empty() some kind of special function where the validity
of indices is not checked? If that is the case, I have two questions:
1. Will this behavior persist in future versions of PHP?
Sure
2. Are there other functions or a general rule where PHP doesn't
output warnings when a nonexistant index is given?
isset() as well for obvious reasons.
-Rasmus
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Re: [PHP] empty function and array indices
From the Manual:
empty() is the opposite of (boolean) var, except that no warning is
generated when the variable is not set
It appears that there is a revamp of what is considered to be empty in PHP
5.
http://php.net/empty
You might be better served with
array_key_exists()
such as:
echo array_key_exists('c', $a)? 'empty':'not empty';
Mark Cain
- Original Message -
From: Gabriel Birke [EMAIL PROTECTED]
To: php-general@lists.php.net
Sent: Sunday, May 01, 2005 4:47 PM
Subject: [PHP] empty function and array indices
Hello!
Suppose I have the following code:
$a = array('a'=1, 'b'=2);
echo empty($a['c'])?'empty':'not empty';
echo $a['c'];
Why doesn't the 2nd line output a warning when error_reporting is set
to E_ALL? Is empty() some kind of special function where the validity
of indices is not checked? If that is the case, I have two questions:
1. Will this behavior persist in future versions of PHP?
2. Are there other functions or a general rule where PHP doesn't
output warnings when a nonexistant index is given?
--
Immanuel doesn't pun, he Kant.
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] empty function and array indices
On Sun, May 1, 2005 1:47 pm, Gabriel Birke said: Is empty() some kind of special function where the validity of indices is not checked? Bingo! That's rather the whole point of empty and isset. :-) The behaviour of empty has changed over time, with various releases. isset seems more stable in that regard, so I prefer to use that one. Also, to me, philosophically and from an application logic perspective, I generally want to do something different when some variable is not set at all, as opposed to having in it. But that's maybe just me. :-) YMMV -- Like Music? http://l-i-e.com/artists.htm -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
