Description:
------------
Description:
------------
strip_tags() removes too much information, it incorrectly interprets <' and <= as tags. In version 5.1.6 strip_tags($string, "<'><=>") (as mentioned in reproducing code) would solve the problem, but in the 5.2.5-dev snapshot it does not and it even cuts out even more text.

Reproduce code:
---------------
<?php
$string = <<<EOD
Message: Database query for getting dateblock titles failed.
MySQL error: 'opening_date >= '2007-01-01' AND closing_date <' at line 1
SQL: SELECT title FROM dateblocks WHERE opening_date >= '2007-01-01' AND closing_date <= '2007-12-31'
Level 1 file: C:\Inetpub\wwwroot\includes\ini_functions_dateblock.php / line <b>563</b>
Level 2 file: C:\Inetpub\wwwroot\includes\ini_functions_dateblock.php / line <b>750</b> / set_dateblock(<b><font color="brown">'add'</font></b>,  array(
  'opening_date' => '10/19/2007',
  'closing_date' => '11/3/2007',
  'title' => 'flajdsflkj',
))
EOD;

echo strip_tags($string);  //this does it INCORRECTLY
#echo strip_tags($string, "<'><=>");  //this one does it CORRECTLY in 5.1.6 (but not newest snapshot)
?>


Expected result:
----------------
Only the <b> and <font> tags should be removed.

Actual result:
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Everything after the first "closing_date" is cut off! In 5.1.6 some of the remaining text was not cut off.