Description:
------------
When submitting a form that contain a string value and defined as text, the POST variable is displayed as a integer.

When filling the form with a text, the POST value is 0, when filling the form with ex 1234, the POST value is 1234.

But strange is another form in the HTML page work perfectly

Reproduce code:
---------------
The Form that works:
<form name='shearch' id='shearch' action='/modules/mpmanager/contbox.php?op=sendbox&send=1&onglet=1' method='post'>
<table width='100%' class='outer' cellspacing='1'>
<tr><th colspan='2'>Trouver un utilisateur</th></tr>
<tr valign='top' align='left'><td class='head'>Recherche</td><td class='even'><input type='text' name='user' id='user' size='25' maxlength='50' value='' />
<input type='submit' class='formButton' name='submit'  id='submit' value='Trouver un utilisateur' />
</td></tr>
<tr valign='top' align='left'><td class='head'>Choix</td><td class='even'>Les mots cl?s de moins de 3 caract?res seront ignor?s
</td></tr>
</table>
</form>

The form that create the issue:
<form name='read' id='read' action='/modules/mpmanager/contbox.php?send=0' method='post'>
<table width='100%' class='outer' cellspacing='1'>
<tr><th colspan='2'>Ajouter un Contact</th></tr>
<tr valign='top' align='left'><td class='head'>Contact(s)</td><td class='even'><input type='text' name='to_userid' id='to_userid' size='25' maxlength='50' value='' />
&nbsp;S?parer par une , Maximum 3 Utilisateur(s)
</td></tr>
<tr valign='top' align='left'><td class='head'></td><td class='even'><input type='reset' class='formButton' name='reset'  id='reset' value='Vider' />
<input type='submit' class='formButton' name='post_messages'  id='post_messages' value='Soumettre' />
</td></tr>
</table>


Expected result:
----------------
on the form that create the issue

if mhm is submitted

to_userid=mhm (string(3))
post_messages= Soumettre (string(9))

Actual result:
--------------
on the form that create the issue

if mhm is submitted

to_userid=0 (int(0))
post_messages= Soumettre (string(9))

if 1234 is submitted

to_userid=int(1234)
post_messages= Soumettre (string(9))