#32671 [Opn->Csd]: Array keys converted from float to integer

ID: 32671 Updated by: vrana@php.net Reported By: marek at lewczuk dot com -Status: Open +Status: Closed Bug Type: Documentation problem Operating System: Linux PHP Version: 5.0.3 New Comment: This bug has been fixed in the documentation's XML sources. Since the online and downloadable versions of the documentation need some time to get updated, we would like to ask you to be a bit patient. Thank you for the report, and for helping us make our documentation better. "Floats in key are truncated to integer." Previous Comments: ------------------------------------------------------------------------ [2005-04-11 20:46:17] marek at lewczuk dot com Maybe is same for PHP4 - I just never had a chance check how this works. So, I understand that this is a proper behavior, right ? ------------------------------------------------------------------------ [2005-04-11 17:45:20] sniper@php.net This is nothing new for PHP 5, same happens with PHP 4. ------------------------------------------------------------------------ [2005-04-11 16:24:44] marek at lewczuk dot com One more example, what problem this "bug/behavior" may cause: $value1 = 345.654; $value2 = 345.655; $array = array(); $array[$value1] = $value1; $array[$value2] = $value2; Result: array ( 345 => 345.655, ) If this is a normal behavior you should put a note about this in the manual. ------------------------------------------------------------------------ [2005-04-11 16:19:04] marek at lewczuk dot com Description: ------------ Suppose we have a float value: $value = 345.332 and we want to use this value as an array key: $array[$value] = $value. This will cause that key will be truncated to integer 345 not to string "345.332". It is written in the manual that: "...A key may be either an integer or a string. If a key is the standard representation of an integer, it will be interpreted as such (i.e. "8" will be interpreted as 8, while "08" will be interpreted as "08")..." From this point of view floats should be converted to strings. I'm not saying that this is a bug, rather I would like to be sure if this is a proper behavior. Simple solution is to type cast float value to string (string), but we have to know that given value is a float (and sometimes, we don't know that). IMHO any other type than integer should be treat as string. Reproduce code: --------------- $value = 345.654; $array = array(); $array[$value] = "Float"; Expected result: ---------------- array ( "345.654" => "Float" ) Actual result: -------------- array ( "345" => "Float" ) ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=32671&edit=1