#39853 [Opn]: strtoupper(), strtolower() function can not work with preg_replace $1 vars

[anton dot kirsanov at gmail dot com]

 ID:               39853
 User updated by:  anton dot kirsanov at gmail dot com
 Reported By:      anton dot kirsanov at gmail dot com
 Status:           Open
 Bug Type:         Strings related
 Operating System: Windows XP SP2
 PHP Version:      4.4.4
 New Comment:

Hi:)
funny...
you will use "/e" modifier if you want parse the pattern as a php code.

Say me, why a function str_repeat() really work in this situation:
<?php
 $s = "A-B";
 echo preg_replace("/\-([a-z])/iU", str_repeat("$1", 10), $s);
?>

// --------------
// ACTUAL RESULT:
// --------------
   ABBBBBBBBBB

Why?

See that:

<?php
 $s = "A-B";
 echo preg_replace("/\-([a-z])/iU", strtolower(str_repeat("$1", 10)),
$s);
?>

// --------------
// ACTUAL RESULT:
// --------------
   ABBBBBBBBBB

// Why that ? :)


Previous Comments:
------------------------------------------------------------------------

[2006-12-16 18:09:15] judas dot iscariote at gmail dot com

Why you think this is a bug ?

you are looking for preg_replace_callback ... or if you are crazy, the
preg_replace "/e" modifier.

not a bug, read the manual ;-)

------------------------------------------------------------------------

[2006-12-16 12:40:44] ara at lenta dot ru

Tu XYu.

------------------------------------------------------------------------

[2006-12-16 12:37:46] anton dot kirsanov at gmail dot com

Sorry, am mix up a 'Expected result' and 'Actual result' :)
Please read this quite the contrary - 'Expected result' is a 'Actual
result'.

------------------------------------------------------------------------

[2006-12-16 12:35:36] ara at lenta dot ru

&#1090;&#1099; &#1093;&#1091;&#1081;

------------------------------------------------------------------------

[2006-12-16 12:33:44] anton dot kirsanov at gmail dot com

Description:
------------
strtoupper(), strtolower() function does not change 
string(as virtual vars - like $1(\\1)) what be returned a preg_replace
function.


Reproduce code:
---------------
<?php
// 1
$s = "A-B";
echo preg_replace("/\-([a-z])/iU", strtolower("$1"), $s);

echo "\n";

// 2
$s = "a-b";
echo preg_replace("/\-([a-z])/iU", strtoupper("$1"), $s);

// 3

$s = "B-B";
echo preg_replace("/([a-z]-[a-z])/i", strtolower("A-$1-A"), $s);


?>

Expected result:
----------------
AB
ab
a-B-B-a

Actual result:
--------------
Ab
aB
abba


------------------------------------------------------------------------


-- 
Edit this bug report at http://bugs.php.net/?id=39853&edit=1