[PHP] Weird Behaviour of Array

2012-03-04 Thread Ruwan Pathmalal 
Hi People,
I confused with weird behaviour of array. Following is my script.

?php
$array = array(
'12_1'=array(
56=array(
23='23',
33='33')
),
'12_5'=array(
55='55'
)
);

$array['12_5'][55][45] = '45';
$array['12_5'][55][56] = '76';
$array['12_5'][55][85] = '85';
$array['12_5'][55][96] = '96';
print_r($array);
?

Output is -:
Array ( [12_1] = Array ( [56] = Array ( [23] = 23 [33] = 33 ) ) [12_5]
= Array ( [55] = 55 4 7 8 9 ) )

Sometime this is because, first time $array['12_5'][55] not an array. I
assigned value to it like array. (I suppose overwrite key and then assign
given value as key value pair). See this part of output [12_5] = Array (
[55] = 55 4 7 8 9 ). It compose 4 from 45, 7 from 76, 8 from 85 like that
(first digit of assigned values).

I manage to overcome this problem by unsettling  $array['12_5'][55] before
assigning value to it.

But I want to know why this happening or is this PHP bug ? (Clear
explanation for situation :) )

Thanks
Ruwan

Re: [PHP] Weird Behaviour of Array

2012-03-04 Thread Ashley Sheridan 
On Sun, 2012-03-04 at 20:01 +0530, Ruwan Pathmalal wrote:

 Hi People,
 I confused with weird behaviour of array. Following is my script.
 
 ?php
 $array = array(
 '12_1'=array(
 56=array(
 23='23',
 33='33')
 ),
 '12_5'=array(
 55='55'
 )
 );
 
 $array['12_5'][55][45] = '45';
 $array['12_5'][55][56] = '76';
 $array['12_5'][55][85] = '85';
 $array['12_5'][55][96] = '96';
 print_r($array);
 ?
 
 Output is -:
 Array ( [12_1] = Array ( [56] = Array ( [23] = 23 [33] = 33 ) ) [12_5]
 = Array ( [55] = 55 4 7 8 9 ) )
 
 Sometime this is because, first time $array['12_5'][55] not an array. I
 assigned value to it like array. (I suppose overwrite key and then assign
 given value as key value pair). See this part of output [12_5] = Array (
 [55] = 55 4 7 8 9 ). It compose 4 from 45, 7 from 76, 8 from 85 like that
 (first digit of assigned values).
 
 I manage to overcome this problem by unsettling  $array['12_5'][55] before
 assigning value to it.
 
 But I want to know why this happening or is this PHP bug ? (Clear
 explanation for situation :) )
 
 Thanks
 Ruwan


I think because $array['12_5'][55] is originally a string, and PHP
allows you to treat them as arrays of characters (like C++) what is
happening is some odd setting of values within the string. This is why
when you unset the value or define it as a blank array it is working as
expected.

-- 
Thanks,
Ash
http://www.ashleysheridan.co.uk

Re: [PHP] Weird Behaviour of Array

2012-03-04 Thread Stuart Dallas 
On 4 Mar 2012, at 14:31, Ruwan Pathmalal wrote:

 I confused with weird behaviour of array. Following is my script.
 
 ?php
 $array = array(
'12_1'=array(
56=array(
23='23',
33='33')
),
'12_5'=array(
55='55'
)
);
 
 $array['12_5'][55][45] = '45';
 $array['12_5'][55][56] = '76';
 $array['12_5'][55][85] = '85';
 $array['12_5'][55][96] = '96';
 print_r($array);
 ?
 
 Output is -:
 Array ( [12_1] = Array ( [56] = Array ( [23] = 23 [33] = 33 ) ) [12_5]
 = Array ( [55] = 55 4 7 8 9 ) )
 
 Sometime this is because, first time $array['12_5'][55] not an array. I
 assigned value to it like array. (I suppose overwrite key and then assign
 given value as key value pair). See this part of output [12_5] = Array (
 [55] = 55 4 7 8 9 ). It compose 4 from 45, 7 from 76, 8 from 85 like that
 (first digit of assigned values).
 
 I manage to overcome this problem by unsettling  $array['12_5'][55] before
 assigning value to it.
 
 But I want to know why this happening or is this PHP bug ? (Clear
 explanation for situation :) )

Not a bug. You set $array['12_5'][55] to a string, then you try to use it as an 
array. Strings can be accessed as arrays.

 $array['12_5'][55][45] = '45';

This line sets the 45th character in the string to 4 (each element of a string 
accessed as an array can only contain a single character, so it throws the 5 
away).

 $array['12_5'][55][56] = '76';
 $array['12_5'][55][85] = '85';
 $array['12_5'][55][96] = '96';

Likewise with these. You're not seeing the additional spaces because you're 
viewing it as an HTML page. Run it on the command line or add pre before the 
?php to see the actual value, which is...

55   4  7  
  8  9

-Stuart

-- 
Stuart Dallas
3ft9 Ltd
http://3ft9.com/
--
PHP General Mailing List (http://www.php.net/)
To unsubscribe, visit: http://www.php.net/unsub.php