Parse error: syntax error, unexpected ';', expecting ')'

SEO用のキーワード変更WordpressPluginを作っています。  
以下のエラーメッセージが発生しました。
どうすればいいですか

発生している問題・エラーメッセージ

Parse error: syntax error, unexpected ';', expecting ')' in xxx/wp-content/plugins/KeywordsChenge/Plugin.php on line 50

該当のソースコード

<?php
/*
Plugin Name: KeywordsChenge
Plugin URI: 
Description: Change the search keyword in the web page.
Version: 1.0
Author: mk
Author URI: 
License: GPL2
*/
/*  Copyright 2016 mk (email : yamk4054@gmail.com)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2, as
     published by the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
//lang
    $mk_kc_lang_title            =    "キーワード管理";
    $mk_kc_lang_screen_title    =    "キーワード管理画面";
    $mk_kc_lang_keyword            =    "キーワード";
    $mk_kc_lang_save_messege    =    "変更を保存しました";
    $mk_kc_lang_save_button        =    "変更を保存";
//settings
    $mk_kc_settings_maxkyes        =    5; //Google of the recommended number of keywords,5 keywords.

add_action( 'admin_menu', 'mk_kc_add_plugin_admin_menu' );
function mk_kc_add_plugin_admin_menu() {add_options_page($mk_kc_lang_title,$mk_kc_lang_screen_title,'administrator', 'keywords','mk_kc_display_plugin_admin_page');}
function mk_kc_display_plugin_admin_page() {
    if ( isset($_POST['mk_kc_options'])) {check_admin_referer('kcoptions');$opt = $_POST['mk_kc_options'];update_option('mk_kc_options', $opt);
    ?>
    <div class="updated fade"><p><strong><?php _e($mk_kc_lang_save_messege); ?></strong></p></div>
    <?php
    } 
    ?>
    <div class="wrap">
    <div id="icon-options-general" class="icon32"><br /></div><h2><?php echo $mk_kc_lang_screen_title ?></h2>
        <form action="" method="post">
            <?php
            wp_nonce_field('kcoptions');
            $opt = get_option('mk_kc_options');
            for ($mk_kc_system_i = 1;$mk_kc_system_i < $mk_kc_settings_maxkyes;$mk_kc_system_i += 1;){
                $show_text[$mk_kc_system_i]    = isset($opt['key'[$mk_kc_system_i]]) ? $opt['key'[$mk_kc_system_i]]: null;
            }
            ?> 
            <table class="form-table">
            <?php for ($mk_kc_system_i = 1,$mk_kc_system_i < $mk_kc_settings_maxkyes,$mk_kc_system_i += 1;){echo "\t<tr valign=\"top\"><th scope=\"row\"><label for=\"inputtext\">" & $mk_kc_lang_keyword & "</label></th><td><input name=\"mk_kc_options[key["$mk_kc_system_i"]]\" type=\"key\" id=\"inputtext\" value=" & $show_text[$mk_kc_system_i] & " class=\"regular-text\" /></td></tr>\n\t\t\t"} ?>
            </table>
            <p class="submit"><input type="submit" name="Submit" class="button-primary" value="<?php echo $mk_kc_lang_save_button ?>" /></p>
        </form>
    <!-- /.wrap --></div>
    <?php}
//main
function mk_kc_get_key($num) {
    $opt        =    get_option('mk_kc_options');
    $array        =    $opt['text'];
    $array[0]    =    "";
    if ($num == "List"){
        return implode(",",$array);
    }elseif (is_int($num)){
        if{
            $array[$num]
        }else{
            return "";
        }
    }else{return "";}

}
?>

補足情報(言語/FW/ツール等のバージョンなど)

PHP 7 wordpress最新

追記

上のは解決したのですが今度は

コード

<?php
/*
Plugin Name: KeywordsChenge
Plugin URI: 
Description: Change the search keyword in the web page.
Version: 1.0
Author: mk
Author URI: 
License: GPL2
*/
/*  Copyright 2016 mk (email : yamk4054@gmail.com)

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2, as
     published by the Free Software Foundation.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
*/
//lang
    $mk_kc_lang_title            =    "キーワード管理";
    $mk_kc_lang_screen_title    =    "キーワード管理画面";
    $mk_kc_lang_keyword            =    "キーワード";
    $mk_kc_lang_save_messege    =    "変更を保存しました";
    $mk_kc_lang_save_button        =    "変更を保存";
//settings
    $mk_kc_settings_maxkyes        =    5; //Google of the recommended number of keywords,5 keywords.

add_action( 'admin_menu', 'mk_kc_add_plugin_admin_menu' );
function mk_kc_add_plugin_admin_menu() {add_options_page($mk_kc_lang_title,$mk_kc_lang_screen_title,'administrator', 'keywords','mk_kc_display_plugin_admin_page');}
function mk_kc_display_plugin_admin_page() {
    if ( isset($_POST['mk_kc_options'])) {check_admin_referer('kcoptions');$opt = $_POST['mk_kc_options'];update_option('mk_kc_options', $opt);
    ?>
    <div class="updated fade"><p><strong><?php _e($mk_kc_lang_save_messege); ?></strong></p></div>
    <?php
    } 
    ?>
    <div class="wrap">
    <div id="icon-options-general" class="icon32"><br /></div><h2><?php echo $mk_kc_lang_screen_title ?></h2>
        <form action="" method="post">
            <?php
            wp_nonce_field('kcoptions');
            $opt = get_option('mk_kc_options');
            for ($mk_kc_system_i = 1;$mk_kc_system_i < $mk_kc_settings_maxkyes;$mk_kc_system_i += 1){
                $show_text[$mk_kc_system_i]    = isset($opt['key'[$mk_kc_system_i]]) ? $opt['key'[$mk_kc_system_i]]: null;
            }
            ?> 
            <table class="form-table">
            <?php
                for ($mk_kc_system_i = 1;$mk_kc_system_i < $mk_kc_settings_maxkyes;$mk_kc_system_i += 1){
                    echo "\t<tr valign=\"top\"><th scope=\"row\"><label for=\"inputtext\">" & $mk_kc_lang_keyword & "</label></th><td><input name=\"mk_kc_options[key["$mk_kc_system_i"]]\" type=\"key\" id=\"inputtext\" value=" & $show_text[$mk_kc_system_i] & " class=\"regular-text\" /></td></tr>\n\t\t\t";
                }
            ?>
            </table>
            <p class="submit"><input type="submit" name="Submit" class="button-primary" value="<?php echo $mk_kc_lang_save_button ?>" /></p>
        </form>
    <!-- /.wrap --></div>
    <?php}
//main
function mk_kc_get_key($num) {
    $opt        =    get_option('mk_kc_options');
    $array        =    $opt['text'];
    $array[0]    =    "";
    if ($num == "List"){
        return implode(",",$array);
    }elseif (is_int($num)){
        if{
            $array[$num]
        }else{
            return "";
        }
    }else{return "";}

}
?>

Parse error: syntax error, unexpected ';', expecting ')' in xxx/wp-content/plugins/KeywordsChenge/Plugin.php on line 56

上のエラーが出てしまいました