ID: 29848
Updated by: [EMAIL PROTECTED]
Reported By: geoff at variosoft dot com
-Status: Open
+Status: Bogus
Bug Type: Arrays related
Operating System: Linux
PHP Version: 4.3.8
New Comment:
This is expected behavior.
Given:
$foo['bar']['baz'] = 'whatever';
Then the follow reference:
$foo['bar']['baz']['bomb']
evaluates as:
$tempvar['bomb']
(with $tempvar representing the string stored in $foo['bar']['baz'])
When accessing a string using [] or {} operators, the portion inside
the operators is automatically converted to an integer. The integer
value of any string which does not begin with a numeric portion is
always 0. Hence you have:
$tempvar[0]
Which represents the first character of the variable.
To change this behavior would represent a major BC break.
To handle this type of situation in userspace, just add an extra
check:
if (is_array($foo['bar']['baz']) && isset($foo['bar']['baz']['bomb']))
{ ... }
Previous Comments:
------------------------------------------------------------------------
[2004-08-26 14:55:16] geoff at variosoft dot com
Description:
------------
In a multi-dimensional assoc array with a depth of x, an unset key at
depth x+1 evaluates unexpectedly to a string when using var_dump() -
the 1st char of the array value.
This means that isset() returns TRUE when testing for the unset key,
which makes it hard to test for non-existence.
An unset key with a depth of x+2 works as expected.
This behaviour has been replicated in 4.3.8 and the 5 previous
versions, all on Linux.
Reproduce code:
---------------
$foo['one']['two'] = 'test-value' ;
if( isset( $foo['one']['two']['three'] ) )
{
print( "Unexpected isset(): evaluated to TRUE<br>" ) ;
}
else
{
print( "Expected isset(): evaluated to FALSE<br>" ) ;
}
print( 'var_dump() output (expecting NULL):<br>' ) ;
var_dump( $foo['one']['two']['three'] ) ;
Expected result:
----------------
As I am testing for an unset key, I expected isset() to return FALSE,
and var_dump() to return NULL.
Actual result:
--------------
In fact, isset() returns TRUE.
var_dump() gives a clue as to what is going on: it returns the first
character of the key's value string.
For unset keys of a depth of x + 2, isset() returns FALSE and
var_dump() returns NULL, as expected.
------------------------------------------------------------------------
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Edit this bug report at http://bugs.php.net/?id=29848&edit=1
