Set max subject length in Admin Panel

[Jessica]

Open includes/acp/acp_board.php

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'warnings_expire_days'    => array('lang' => 'WARNINGS_EXPIRE',        'validate' => 'int',    'type' => 'text:3:4', 'explain' => true, 'append' => ' ' . $user->lang['DAYS']),
'legend3'                    => 'ACP_SUBMIT_CHANGES',

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// subject length in ACP - Ather   
    'legend3'            => 'SL_SETTINGS',
    'SL'      => array('lang' => 'SL',      'validate' => 'int',   'type' => 'text:4:4', 'explain' => false),
// subject length in ACP - Ather 

Open language/en/acp/board.php

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 'BOARD_PM_EXPLAIN'         => 'Enable or disable private messaging for all users.',

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// subject length in ACP - Ather
'SL' => 'Subject Length',
// subject length in ACP - Ather

Open language/en/acp/common.php

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 'ACP_ADMINISTRATORS'      => 'Administrators',

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// subject length in ACP - Ather
'SL_SETTINGS' => 'Subject Length Settings',
// subject length in ACP - Ather

Open includes/functions.php
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$template->assign_vars(array(
        'SITENAME'                        => $config['sitename'],

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// subject length in ACP - Ather
'SL'      => $config['SL'],
// subject length in ACP - Ather

Open includes/functions_posting.php

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$subject = truncate_string($subject);

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// subject length in ACP - Ather
$subject = truncate_string($subject, $config['SL']);
// subject length in ACP - Ather

Open styles/YOURTEMPLATE/template/posting_editor.html

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<dl style="clear: left;">
        <dt><label for="subject">{L_SUBJECT}:</label></dt>
        <dd><input type="text" name="subject" id="subject" size="45" maxlength="<!-- IF S_NEW_MESSAGE -->60<!-- ELSE -->64<!-- ENDIF -->" tabindex="2" value="{SUBJECT}{DRAFT_SUBJECT}" class="inputbox autowidth" /></dd>
    </dl>

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<dl style="clear: left;">
            <dt><label for="subject">{L_SUBJECT}:</label></dt>
            <dd><input type="text" name="subject" id="subject" size="45" maxlength="<!-- IF S_NEW_MESSAGE -->{SL}<!-- ELSE -->{SL}<!-- ENDIF -->" tabindex="2" value="{SUBJECT}{DRAFT_SUBJECT}" class="inputbox autowidth" /></dd>
        </dl>