diff --git a/adm/member_list.php b/adm/member_list.php
index 96abd12cf..bb3be84c6 100644
--- a/adm/member_list.php
+++ b/adm/member_list.php
@@ -260,7 +260,7 @@ $colspan = 16;
                         <td headers="mb_list_mailr" class="td_consent">
                             <label for="mb_mailling_<?php echo $i; ?>" class="sound_only">메일수신</label>
                             <input type="checkbox" name="mb_mailling[<?php echo $i; ?>]" <?php echo $row['mb_mailling'] ? 'checked' : ''; ?> value="1" id="mb_mailling_<?php echo $i; ?>">
-                            <input type="hidden" name="mb_mailling_default[<?php echo $i; ?>]" value="<?php echo $row['mb_mailling'] ?? '0'; ?> " id="mb_mailling_default_<?php echo $i; ?>">
+                            <input type="hidden" name="mb_mailling_default[<?php echo $i; ?>]" value="<?php echo isset($row['mb_mailling']) ? $row['mb_mailling'] : '0'; ?> " id="mb_mailling_default_<?php echo $i; ?>">
                         </td>
                         <td headers="mb_list_auth" class="td_mbstat">
                             <?php
@@ -285,7 +285,7 @@ $colspan = 16;
                         <td headers="mb_list_sms">
                             <label for="mb_sms_<?php echo $i; ?>" class="sound_only">SMS수신</label>
                             <input type="checkbox" name="mb_sms[<?php echo $i; ?>]" <?php echo $row['mb_sms'] ? 'checked' : ''; ?> value="1" id="mb_sms_<?php echo $i; ?>">
-                            <input type="hidden" name="mb_sms_default[<?php echo $i; ?>]" value="<?php echo $row['mb_sms'] ?? '0'; ?> " id="mb_sms_default_<?php echo $i; ?>">
+                            <input type="hidden" name="mb_sms_default[<?php echo $i; ?>]" value="<?php echo isset($row['mb_sms']) ? $row['mb_sms'] : '0'; ?> " id="mb_sms_default_<?php echo $i; ?>">
                         </td>
                         <td headers="mb_list_adultc">
                             <label for="mb_adult_<?php echo $i; ?>" class="sound_only">성인인증</label>
diff --git a/adm/member_list_exel.lib.php b/adm/member_list_exel.lib.php
index cdce04c8d..bd5826de4 100644
--- a/adm/member_list_exel.lib.php
+++ b/adm/member_list_exel.lib.php
@@ -49,7 +49,7 @@ function get_export_config($type = null)
         ],
     ];
 
-    return $type ? ($config[$type] ?? []) : $config;
+    return $type ? (isset($config[$type]) ? $config[$type] : []) : $config;
 }
 
 /**
@@ -58,7 +58,7 @@ function get_export_config($type = null)
 function get_member_export_params() 
 {
     // 친구톡 양식 - 엑셀 양식에 포함할 항목
-    $fieldArray = array_map('trim', explode(',',  $_GET['fields'] ?? ''));
+    $fieldArray = array_map('trim', explode(',',  isset($_GET['fields']) ? $_GET['fields'] : ''));
     $vars = [];
     foreach ($fieldArray as $index => $field) {
         if(!empty($field)){
@@ -68,29 +68,29 @@ function get_member_export_params()
 
     $params = [    
         'page'              => 1,
-        'formatType'        => (int)($_GET['formatType'] ?? 1),
-        'use_stx'           => $_GET['use_stx'] ?? 0,
-        'stx_cond'          => clean_xss_tags($_GET['stx_cond'] ?? 'like'),
-        'sfl'               => clean_xss_tags($_GET['sfl'] ?? ''),
-        'stx'               => clean_xss_tags($_GET['stx'] ?? ''),
-        'use_level'         => $_GET['use_level'] ?? 0,
-        'level_start'       => (int)($_GET['level_start'] ?? 1),
-        'level_end'         => (int)($_GET['level_end'] ?? 10),
-        'use_date'          => $_GET['use_date'] ?? 0,
-        'date_start'        => clean_xss_tags($_GET['date_start'] ?? ''),
-        'date_end'          => clean_xss_tags($_GET['date_end'] ?? ''),
-        'use_point'         => $_GET['use_point'] ?? 0,
-        'point'             => $_GET['point'] ?? '',
-        'point_cond'        => $_GET['point_cond'] ?? 'gte',
-        'use_hp_exist'      => $_GET['use_hp_exist'] ?? 0,
-        'ad_range_only'     => $_GET['ad_range_only'] ?? 0,
-        'ad_range_type'     => clean_xss_tags($_GET['ad_range_type'] ?? 'all'),
-        'ad_mailling'       => $_GET['ad_mailling'] ?? 0,
-        'ad_sms'            => $_GET['ad_sms'] ?? 0,
-        'agree_date_start'  => clean_xss_tags($_GET['agree_date_start'] ?? ''),
-        'agree_date_end'    => clean_xss_tags($_GET['agree_date_end'] ?? ''),
-        'use_intercept'     => $_GET['use_intercept'] ?? 0,
-        'intercept'         => clean_xss_tags($_GET['intercept'] ?? 'exclude'),
+        'formatType'        => (int)(isset($_GET['formatType']) ? $_GET['formatType'] : 1),
+        'use_stx'           => isset($_GET['use_stx']) ? $_GET['use_stx'] : 0,
+        'stx_cond'          => clean_xss_tags(isset($_GET['stx_cond']) ? $_GET['stx_cond'] : 'like'),
+        'sfl'               => clean_xss_tags(isset($_GET['sfl']) ? $_GET['sfl'] : ''),
+        'stx'               => clean_xss_tags(isset($_GET['stx']) ? $_GET['stx'] : ''),
+        'use_level'         => isset($_GET['use_level']) ? $_GET['use_level'] : 0,
+        'level_start'       => (int)(isset($_GET['level_start']) ? $_GET['level_start'] : 1),
+        'level_end'         => (int)(isset($_GET['level_end']) ? $_GET['level_end'] : 10),
+        'use_date'          => isset($_GET['use_date']) ? $_GET['use_date'] : 0,
+        'date_start'        => clean_xss_tags(isset($_GET['date_start']) ? $_GET['date_start'] : ''),
+        'date_end'          => clean_xss_tags(isset($_GET['date_end']) ? $_GET['date_end'] : ''),
+        'use_point'         => isset($_GET['use_point']) ? $_GET['use_point'] : 0,
+        'point'             => isset($_GET['point']) ? $_GET['point'] : '',
+        'point_cond'        => isset($_GET['point_cond']) ? $_GET['point_cond'] : 'gte',
+        'use_hp_exist'      => isset($_GET['use_hp_exist']) ? $_GET['use_hp_exist'] : 0,
+        'ad_range_only'     => isset($_GET['ad_range_only']) ? $_GET['ad_range_only'] : 0,
+        'ad_range_type'     => clean_xss_tags(isset($_GET['ad_range_type']) ? $_GET['ad_range_type'] : 'all'),
+        'ad_mailling'       => isset($_GET['ad_mailling']) ? $_GET['ad_mailling'] : 0,
+        'ad_sms'            => isset($_GET['ad_sms']) ? $_GET['ad_sms'] : 0,
+        'agree_date_start'  => clean_xss_tags(isset($_GET['agree_date_start']) ? $_GET['agree_date_start'] : ''),
+        'agree_date_end'    => clean_xss_tags(isset($_GET['agree_date_end']) ? $_GET['agree_date_end'] : ''),
+        'use_intercept'     => isset($_GET['use_intercept']) ? $_GET['use_intercept'] : 0,
+        'intercept'         => clean_xss_tags(isset($_GET['intercept']) ? $_GET['intercept'] : 'exclude'),
         'vars'              => $vars,
     ];
     
@@ -212,7 +212,7 @@ function member_export_build_where($params)
     
     // 정보수신동의 조건
     if (!empty($params['ad_range_only']) && $params['ad_range_only'] === '1') {
-        $range = $params['ad_range_type'] ?? '';
+        $range = isset($params['ad_range_type']) ? $params['ad_range_type'] : '';
 
         // 공통: 마케팅 목적 수집·이용 동의 + (필요 시) 제3자 동의
         $thirdparty_clause = $config['cf_sms_use'] !== '' ? " AND mb_thirdparty_agree = 1" : "";        
@@ -241,8 +241,8 @@ function member_export_build_where($params)
         
             } else {
                 // 수신동의기간 직접 입력 - custom_period
-                $date_start = $params['agree_date_start'] ?? '';
-                $date_end   = $params['agree_date_end'] ?? '';
+                $date_start = isset($params['agree_date_start']) ? $params['agree_date_start'] : '';
+                $date_end   = isset($params['agree_date_end']) ? $params['agree_date_end'] : '';
 
                 if ($date_start && $date_end) {
                     $emailDateCond = "mb_mailling_date BETWEEN '{$date_start} 00:00:00' AND '{$date_end} 23:59:59'";
diff --git a/adm/member_list_exel.php b/adm/member_list_exel.php
index db16c4e55..994ae979f 100644
--- a/adm/member_list_exel.php
+++ b/adm/member_list_exel.php
@@ -69,10 +69,10 @@ $colspan = 14;
                             }
                         ?>
                     </select>
-                    <input type="text" name="stx" value="<?php echo htmlspecialchars($_GET['stx'] ?? ''); ?>" placeholder="검색어 입력">
+                    <input type="text" name="stx" value="<?php echo htmlspecialchars(isset($_GET['stx']) ? $_GET['stx'] : ''); ?>" placeholder="검색어 입력">
                     <span class="radio_group">
-                        <label><input type="radio" name="stx_cond" value="like" <?php echo ($_GET['stx_cond'] ?? 'like') === 'like' ? 'checked' : ''; ?>> 포함</label>
-                        <label><input type="radio" name="stx_cond" value="equal" <?php echo ($_GET['stx_cond'] ?? '') === 'equal' ? 'checked' : ''; ?>> 일치</label>
+                        <label><input type="radio" name="stx_cond" value="like" <?php echo (isset($_GET['stx_cond']) ? $_GET['stx_cond'] : 'like') === 'like' ? 'checked' : ''; ?>> 포함</label>
+                        <label><input type="radio" name="stx_cond" value="equal" <?php echo (isset($_GET['stx_cond']) ? $_GET['stx_cond'] : '') === 'equal' ? 'checked' : ''; ?>> 일치</label>
                     </span>
                 </div>
             </div>
@@ -102,8 +102,8 @@ $colspan = 14;
                     <label><input type="checkbox" name="use_date" value="1" <?php echo isset($_GET['use_date']) ? 'checked' : ''; ?>> 가입기간 적용</label>
                 </div>
                 <div class="field">
-                    <input type="date" name="date_start" max="9999-12-31" value="<?php echo htmlspecialchars($_GET['date_start'] ?? ''); ?>"> ~
-                    <input type="date" name="date_end" max="9999-12-31" value="<?php echo htmlspecialchars($_GET['date_end'] ?? ''); ?>">
+                    <input type="date" name="date_start" max="9999-12-31" value="<?php echo htmlspecialchars(isset($_GET['date_start']) ? $_GET['date_start'] : ''); ?>"> ~
+                    <input type="date" name="date_end" max="9999-12-31" value="<?php echo htmlspecialchars(isset($_GET['date_end']) ? $_GET['date_end'] : ''); ?>">
                 </div>
             </div>
 
@@ -113,11 +113,11 @@ $colspan = 14;
                     <label><input type="checkbox" name="use_point" value="1" <?php echo isset($_GET['use_point']) ? 'checked' : ''; ?>> 포인트 적용</label>
                 </div>
                 <div class="field">
-                    <input type="number" name="point" value="<?php echo htmlspecialchars($_GET['point'] ?? ''); ?>" placeholder="포인트 입력">
+                    <input type="number" name="point" value="<?php echo htmlspecialchars(isset($_GET['point']) ? $_GET['point'] : ''); ?>" placeholder="포인트 입력">
                     <span class="radio_group">
-                        <label><input type="radio" name="point_cond" value="gte" <?php echo ($_GET['point_cond'] ?? 'gte') === 'gte' ? 'checked' : ''; ?>> 이상</label>
-                        <label><input type="radio" name="point_cond" value="lte" <?php echo ($_GET['point_cond'] ?? '') === 'lte' ? 'checked' : ''; ?>> 이하</label>
-                        <label><input type="radio" name="point_cond" value="eq" <?php echo ($_GET['point_cond'] ?? '') === 'eq' ? 'checked' : ''; ?>> 일치</label>
+                        <label><input type="radio" name="point_cond" value="gte" <?php echo (isset($_GET['point_cond']) ? $_GET['point_cond'] : 'gte') === 'gte' ? 'checked' : ''; ?>> 이상</label>
+                        <label><input type="radio" name="point_cond" value="lte" <?php echo (isset($_GET['point_cond']) ? $_GET['point_cond'] : '') === 'lte' ? 'checked' : ''; ?>> 이하</label>
+                        <label><input type="radio" name="point_cond" value="eq" <?php echo (isset($_GET['point_cond']) ? $_GET['point_cond'] : '') === 'eq' ? 'checked' : ''; ?>> 일치</label>
                     </span>
                 </div>
             </div>
@@ -132,7 +132,7 @@ $colspan = 14;
                         <?php
                             // 차단회원 옵션 : [정의] get_export_config() - adm/member_list_exel.lib.php
                             foreach (get_export_config('intercept_list') as $val => $label) {
-                                $selected = (($_GET['intercept'] ?? '') === $val) ? 'selected' : '';
+                                $selected = ((isset($_GET['intercept']) ? $_GET['intercept'] : '') === $val) ? 'selected' : '';
                                 echo "<option value=\"$val\" $selected>$label</option>";
                             }
                         ?>
@@ -171,7 +171,7 @@ $colspan = 14;
                             <select name="ad_range_type" id="ad_range_type">
                                 <?php 
                                     foreach (get_export_config('ad_range_list') as $val => $label) {
-                                        $selected = (($_GET['ad_range_type'] ?? '') === $val) ? 'selected' : '';
+                                        $selected = ((isset($_GET['ad_range_type']) ? $_GET['ad_range_type'] : '') === $val) ? 'selected' : '';
                                         echo "<option value=\"$val\" $selected>$label</option>";
                                     }
                                 ?>
@@ -179,10 +179,10 @@ $colspan = 14;
 
                             <div class="ad_range_wrap">
                                 <!-- 기간 직접 입력 -->
-                                <div class="ad_range_box <?php echo isset($_GET['ad_range_only']) && ($_GET['ad_range_type'] ?? '') == 'custom_period' ? '' : 'is-hidden'; ?>">
+                                <div class="ad_range_box <?php echo isset($_GET['ad_range_only']) && (isset($_GET['ad_range_type']) ? $_GET['ad_range_type'] : '') == 'custom_period' ? '' : 'is-hidden'; ?>">
                                     <div class="field">
-                                        <input type="date" name="agree_date_start" max="9999-12-31" value="<?php echo htmlspecialchars($_GET['agree_date_start'] ?? date('Y-m-d', strtotime('-1 month'))); ?>"> ~
-                                        <input type="date" name="agree_date_end" max="9999-12-31" value="<?php echo htmlspecialchars($_GET['agree_date_end'] ?? date('Y-m-d')); ?>">
+                                        <input type="date" name="agree_date_start" max="9999-12-31" value="<?php echo htmlspecialchars(isset($_GET['agree_date_start']) ? $_GET['agree_date_start'] : date('Y-m-d', strtotime('-1 month'))); ?>"> ~
+                                        <input type="date" name="agree_date_end" max="9999-12-31" value="<?php echo htmlspecialchars(isset($_GET['agree_date_end']) ? $_GET['agree_date_end'] : date('Y-m-d')); ?>">
                                         <p>* 광고성 정보 수신(<b>이메일 또는 SMS/카카오톡</b>) 동의일자 기준</p>
                                     </div>
                                 </div>
diff --git a/adm/member_list_exel_export.php b/adm/member_list_exel_export.php
index 9421b5905..ffaebf3f1 100644
--- a/adm/member_list_exel_export.php
+++ b/adm/member_list_exel_export.php
@@ -25,7 +25,7 @@ $resultExcelDelete = member_export_delete();
 member_export_set_sse_headers();
 
 // 모드 확인 
-$mode = $_GET['mode'] ?? '';
+$mode = isset($_GET['mode']) ? $_GET['mode'] : '';
 if ($mode !== 'start') {
     member_export_send_progress("error", "잘못된 요청 입니다.");
     member_export_write_log($params, ['success' => false, 'error' => '잘못된 요청 입니다.']);
@@ -107,7 +107,7 @@ function main_member_export($params)
         member_export_send_progress("progress", "", 1, $total, $total);                
     }
     
-    member_export_write_log($params, ['success' => true, 'total' => $total, 'files' => $fileList, 'zip' => $zipFileName ?? null]);
+    member_export_write_log($params, ['success' => true, 'total' => $total, 'files' => $fileList, 'zip' => isset($zipFileName) ? $zipFileName : null]);
     member_export_send_progress("done", "", 2, $total, $total, $pages, $pages, $fileList, $zipFileName);                
 }
 
@@ -211,13 +211,13 @@ function member_export_get_data($params)
     // SQL 필드 생성
     $sqlFields = [];
     foreach ($fields as $field) {
-        $sqlFields[] = $sqlTransformMap[$field] ?? $field;
+        $sqlFields[] = isset($sqlTransformMap[$field]) ? $sqlTransformMap[$field] : $field;
     }
     $field_list = implode(', ', $sqlFields);
 
     $where = member_export_build_where($params);
 
-    $page = (int)($params['page'] ?? 1);
+    $page = (int)(isset($params['page']) ? $params['page'] : 1);
     if ($page < 1) $page = 1;
     $offset = ($page - 1) * MEMBER_EXPORT_PAGE_SIZE;
 
@@ -233,7 +233,7 @@ function member_export_get_data($params)
     while ($row = sql_fetch_array($result)) {
         $rowData = [];
         foreach ($fields as $field) {
-            $rowData[] = $row[$field] ?? '';
+            $rowData[] = isset($row[$field]) ? $row[$field] : '';
         }
         $excelData[] = $rowData;
     }
@@ -430,7 +430,7 @@ function member_export_write_log($params, $result = [])
 
     $maxSize = 1024 * 1024 * 2; // 2MB
     $maxFiles = 10; // 최대 로그 파일 수 (필요시 조정)
-    $username = $member['mb_id'] ?? 'guest';
+    $username = isset($member['mb_id']) ? $member['mb_id'] : 'guest';
     $datetime = date("Y-m-d H:i:s");
 
     if (!is_dir(MEMBER_LOG_DIR)) {
@@ -443,7 +443,7 @@ function member_export_write_log($params, $result = [])
     // 최신 파일 기준 정렬 (최신 → 오래된)
     usort($logFiles, fn($a, $b) => filemtime($b) - filemtime($a));
     
-    $latestLogFile = $logFiles[0] ?? null;
+    $latestLogFile = isset($logFiles[0]) ? $logFiles[0] : null;
 
     // 용량 기준으로 새 파일 생성
     if (!$latestLogFile || filesize($latestLogFile) >= $maxSize) {
@@ -470,7 +470,7 @@ function member_export_write_log($params, $result = [])
     if ($params['use_stx'] == 1 && !empty($params['stx'])) {
         $sfl_list = get_export_config('sfl_list');
 
-        $label = $sfl_list[$params['sfl']] ?? '';
+        $label = isset($sfl_list[$params['sfl']]) ? $sfl_list[$params['sfl']] : '';
         $condition[] = "검색({$params['stx_cond']}) : {$label} - {$params['stx']}";
     }
     
@@ -487,7 +487,7 @@ function member_export_write_log($params, $result = [])
     // 포인트 조건
     if ($params['use_point'] == 1 && $params['point'] !== '') {
         $point_cond_map = get_export_config('point_cond_map');
-        $symbol = $point_cond_map[$params['point_cond']] ?? '≥';
+        $symbol = isset($point_cond_map[$params['point_cond']]) ? $point_cond_map[$params['point_cond']] : '≥';
         $condition[] = "포인트 {$symbol} {$params['point']}";
     }
     
@@ -499,7 +499,7 @@ function member_export_write_log($params, $result = [])
     // 광고 수신 동의
     if ($params['ad_range_only'] == 1) {
         $ad_range_list = get_export_config('ad_range_list');
-        $label = $ad_range_list[$params['ad_range_type']] ?? '';
+        $label = isset($ad_range_list[$params['ad_range_type']]) ? $ad_range_list[$params['ad_range_type']] : '';
         $condition[] = "수신동의: 예 ({$label})";
 
         if ($params['ad_range_type'] == "custom_period" && ($params['agree_date_start'] || $params['agree_date_end'])) {
@@ -521,7 +521,7 @@ function member_export_write_log($params, $result = [])
     // 차단회원 처리
     if ($params['use_intercept'] == 1) {
         $intercept_list = get_export_config('intercept_list');
-        $label = $intercept_list[$params['intercept']] ?? '';
+        $label = isset($intercept_list[$params['intercept']]) ? $intercept_list[$params['intercept']] : '';
         if ($label) $condition[] = $label;
     }
 
@@ -530,8 +530,8 @@ function member_export_write_log($params, $result = [])
 
     // 성공일 경우 추가 정보
     if ($success) {
-        $total = $result['total'] ?? 0;
-        $fileCount = isset($result['zip']) ? 1 : count($result['files'] ?? []);
+        $total = isset($result['total']) ? $result['total'] : 0;
+        $fileCount = isset($result['zip']) ? 1 : count(isset($result['files']) ? $result['files'] : []);
         $line1 .= " | 총 {$total}건 | 파일: {$fileCount}개";
     }