Description:
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A number of mail clients or mail generating scripts generate Date: headers that use the following format:

Sun, 13 Nov 2005 22:56:10 -0800 (PST)

The final part - " (PST)" is not required (and probably technically invalid) by the date format described in RFC 2822, however, it's also probably valid as a header comment. Prior to the 5.1 branch, PHP's strtotime simply ignored comments in this style; however, with 5.1, it causes strtotime to fail and return false. Valid or invalid I think it'd be good for PHP to ignore these and just parse the rest of the date.

Reproduce code:
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<?php

$date = 'Sun, 13 Nov 2005 22:56:10 -0800 (PST)';
$date_fixed = 'Sun, 13 Nov 2005 22:56:10 -0800';

var_dump(strtotime($date));
var_dump(strtotime($date_fixed));


Expected result:
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int(1131951370)
int(1131951370)

Actual result:
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bool(false)
int(1131951370)