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Bug #42677 PHP converts all dot(.) in from field names to Underscore(_)
Submitted: 2007-09-15 17:00 UTC Modified: 2007-09-15 19:28 UTC
From: neel dot basu dot z at gmail dot com Assigned:
Status: Not a bug Package: Filter related
PHP Version: 5.2.4 OS: Debian
Private report: No CVE-ID: None
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From: neel dot basu dot z at gmail dot com
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 [2007-09-15 17:00 UTC] neel dot basu dot z at gmail dot com
If form field name contains any dot(.) PHP automatically 
Stores it into $_POST variable after converting all dots to _

Reproduce code:
if(count($_POST) > 0){
<form method="POST" action="">
<input type="text" name="a.b" value="Sample" />
<input type="Submit" name="submit" value="Submit">

Expected result:
  [a.b] => Sample 
  [submit] => Submit

Actual result:
  [a_b] => Sample 
  [submit] => Submit


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 [2007-09-15 19:28 UTC]
Sorry, but your problem does not imply a bug in PHP itself.  For a
list of more appropriate places to ask for help using PHP, please
visit as this bug system is not the
appropriate forum for asking support questions.  Due to the volume
of reports we can not explain in detail here why your report is not
a bug.  The support channels will be able to provide an explanation
for you.

Thank you for your interest in PHP.

with register_globals on $a.b wouldn't be a valid variable name, so this is expected behavior.
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