diff --git a/modules/performance/php-optimizer.sh b/modules/performance/php-optimizer.sh
index 51a6dca..50d426a 100755
--- a/modules/performance/php-optimizer.sh
+++ b/modules/performance/php-optimizer.sh
@@ -118,17 +118,25 @@ select_domain() {
     done
 
     echo ""
-    read -p "Select domain number (or 'q' to cancel): " selection
+    cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
 
-    if [[ "$selection" == "q" ]]; then
-        return 1
-    fi
+    # Validate domain selection with retry loop
+    while true; do
+        read -p "Select domain number (or 'q' to cancel): " selection
 
-    if ! [[ "$selection" =~ ^[0-9]+$ ]] || [ "$selection" -lt 1 ] || [ "$selection" -gt ${#domains[@]} ]; then
-        cecho "${RED}Invalid selection${NC}"
-        sleep 2
-        return 1
-    fi
+        if [[ "$selection" == "q" ]]; then
+            return 1
+        fi
+
+        if ! [[ "$selection" =~ ^[0-9]+$ ]] || [ "$selection" -lt 1 ] || [ "$selection" -gt ${#domains[@]} ]; then
+            echo ""
+            cecho "${RED}Invalid selection. Please enter a number 1-${#domains[@]}${NC}"
+            echo ""
+            continue
+        fi
+
+        break
+    done
 
     # Return selected domain and username
     local selected_domain="${domains[$((selection - 1))]}"
@@ -178,9 +186,8 @@ analyze_all_domains() {
     echo ""
     cecho "${YELLOW}This will analyze PHP configuration for ALL domains...${NC}"
     echo ""
-    read -p "Continue? (y/n): " confirm
 
-    if [[ ! "$confirm" =~ ^[Yy]$ ]]; then
+    if ! confirm "Continue?"; then
         return
     fi
 
@@ -552,14 +559,30 @@ optimize_domain() {
     [ "${opt_available[opcache]}" = "true" ] && cecho "  ${GREEN}2${NC}) Apply OPcache optimization only"
     cecho "  ${RED}n${NC}) Cancel - don't apply any changes"
     echo ""
-    read -p "Select option: " apply_choice
+    cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
+
+    # Validate optimization selection with retry loop
+    while true; do
+        read -p "Select option: " apply_choice
+
+        if ! [[ "$apply_choice" =~ ^[a1A2nN]$ ]]; then
+            echo ""
+            cecho "${RED}Invalid selection. Please enter a, 1, 2, or n${NC}"
+            echo ""
+            continue
+        fi
+        break
+    done
 
     # Determine which optimizations to apply
     local apply_max_children=false
     local apply_opcache=false
 
+    # Convert to lowercase for consistent case matching
+    apply_choice=${apply_choice,,}
+
     case "$apply_choice" in
-        a|A)
+        a)
             apply_max_children=${opt_available[max_children]:-false}
             apply_opcache=${opt_available[opcache]:-false}
             ;;
@@ -569,7 +592,7 @@ optimize_domain() {
         2)
             apply_opcache=${opt_available[opcache]:-false}
             ;;
-        n|N|*)
+        n)
             cecho "${YELLOW}Optimization cancelled - no changes made${NC}"
             echo ""
             read -p "Press Enter to continue..."
@@ -643,9 +666,8 @@ optimize_domain() {
         echo ""
         cecho "${YELLOW}Changes have been applied. Restart PHP-FPM for changes to take effect.${NC}"
         echo ""
-        read -p "Restart PHP-FPM now? (y/n): " restart_choice
 
-        if [[ "$restart_choice" =~ ^[Yy]$ ]]; then
+        if confirm "Restart PHP-FPM now?"; then
             # Detect PHP version
             local php_version
             php_version=$(detect_php_version_for_domain "$username" "$domain")
@@ -699,9 +721,8 @@ optimize_all_domains() {
     echo ""
     cecho "${RED}${BOLD}WARNING:${NC} ${RED}This will modify PHP-FPM pool configurations server-wide!${NC}"
     echo ""
-    read -p "Continue with server-wide optimization? (yes/no): " confirm
 
-    if [ "$confirm" != "yes" ]; then
+    if ! confirm "Continue with server-wide optimization?"; then
         cecho "${YELLOW}Operation cancelled${NC}"
         read -p "Press Enter to continue..."
         return
@@ -832,12 +853,26 @@ optimize_all_domains() {
     cecho "  ${GREEN}s${NC}) Select individual domains/users to optimize"
     cecho "  ${RED}n${NC}) Cancel - don't apply any changes"
     echo ""
-    read -p "Select option: " apply_confirm
+    cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
+
+    # Validate apply selection with retry loop
+    while true; do
+        read -p "Select option: " apply_confirm
+
+        if ! [[ "$apply_confirm" =~ ^[aAsSnN]$ ]]; then
+            echo ""
+            cecho "${RED}Invalid selection. Please enter a, s, or n${NC}"
+            echo ""
+            continue
+        fi
+        break
+    done
 
     # Handle selection mode
     declare -A domains_to_apply
+    apply_confirm=${apply_confirm,,}
     case "$apply_confirm" in
-        a|A|yes)
+        a)
             # Apply all - mark all domains/users for optimization
             if [ "$SYS_CONTROL_PANEL" = "cpanel" ]; then
                 for domain in "${!recommended_values[@]}"; do
@@ -849,7 +884,7 @@ optimize_all_domains() {
                 done
             fi
             ;;
-        s|S)
+        s)
             # Individual selection
             echo ""
             cecho "${WHITE}${BOLD}SELECT DOMAINS/USERS TO OPTIMIZE${NC}"
@@ -883,14 +918,18 @@ optimize_all_domains() {
             fi
 
             echo ""
+            cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
             read -p "Enter selection: " user_selection
 
-            if [[ "$user_selection" =~ ^(all|ALL)$ ]]; then
+            # Normalize input to lowercase
+            user_selection=$(echo "$user_selection" | tr '[:upper:]' '[:lower:]')
+
+            if [[ "$user_selection" == "all" ]]; then
                 # Select all
                 for item in "${selection_list[@]}"; do
                     domains_to_apply["$item"]="true"
                 done
-            elif [[ "$user_selection" =~ ^(none|NONE|n|N)$ ]]; then
+            elif [[ "$user_selection" =~ ^(none|n)$ ]]; then
                 cecho "${YELLOW}Optimization cancelled${NC}"
                 echo ""
                 read -p "Press Enter to continue..."
@@ -916,7 +955,7 @@ optimize_all_domains() {
             echo ""
             cecho "${GREEN}Selected ${#domains_to_apply[@]} domain(s)/user(s) for optimization${NC}"
             ;;
-        n|N|*)
+        n)
             cecho "${YELLOW}Optimization cancelled${NC}"
             read -p "Press Enter to continue..."
             return
@@ -1463,9 +1502,7 @@ check_server_memory_capacity() {
     echo ""
 
     # Ask if user wants detailed breakdown
-    read -p "Show detailed per-user breakdown? (y/n): " show_details
-
-    if [[ "$show_details" =~ ^[Yy]$ ]]; then
+    if confirm "Show detailed per-user breakdown?"; then
         echo ""
         cecho "${WHITE}${BOLD}PER-USER BREAKDOWN${NC}"
         cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
@@ -1484,9 +1521,8 @@ check_server_memory_capacity() {
 
     # Ask if user wants balanced recommendations
     echo ""
-    read -p "Calculate balanced memory allocation recommendations? (y/n): " show_recommendations
 
-    if [[ "$show_recommendations" =~ ^[Yy]$ ]]; then
+    if confirm "Calculate balanced memory allocation recommendations?"; then
         echo ""
         cecho "${WHITE}${BOLD}BALANCED MEMORY ALLOCATION RECOMMENDATIONS${NC}"
         cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
@@ -1627,17 +1663,25 @@ restore_configurations() {
     mapfile -t backup_array < <(echo "$backups" | tail -n +2 | cut -d'|' -f1)
 
     echo ""
-    read -p "Select backup number to restore (or 'q' to cancel): " selection
+    cecho "${CYAN}─────────────────────────────────────────────────────────────────────${NC}"
 
-    if [[ "$selection" == "q" ]]; then
-        return
-    fi
+    # Validate backup selection with retry loop
+    while true; do
+        read -p "Select backup number to restore (or 'q' to cancel): " selection
 
-    if ! [[ "$selection" =~ ^[0-9]+$ ]] || [ "$selection" -lt 1 ] || [ "$selection" -gt ${#backup_array[@]} ]; then
-        cecho "${RED}Invalid selection${NC}"
-        sleep 2
-        return
-    fi
+        if [[ "$selection" == "q" ]]; then
+            return
+        fi
+
+        if ! [[ "$selection" =~ ^[0-9]+$ ]] || [ "$selection" -lt 1 ] || [ "$selection" -gt ${#backup_array[@]} ]; then
+            echo ""
+            cecho "${RED}Invalid selection. Please enter a number 1-${#backup_array[@]}${NC}"
+            echo ""
+            continue
+        fi
+
+        break
+    done
 
     local selected_backup="${backup_array[$((selection - 1))]}"
 
@@ -1645,9 +1689,8 @@ restore_configurations() {
     echo ""
     cecho "${YELLOW}${BOLD}WARNING: This will overwrite current configurations!${NC}"
     echo ""
-    read -p "Are you sure you want to restore from $selected_backup? (yes/no): " confirm
 
-    if [[ "$confirm" != "yes" ]]; then
+    if ! confirm "Are you sure you want to restore from $selected_backup?"; then
         cecho "${YELLOW}Restore cancelled${NC}"
         sleep 2
         return
@@ -1697,7 +1740,21 @@ main() {
         show_banner
         show_main_menu
 
-        read -p "Select option: " choice
+        # Validate choice input with retry loop
+        while true; do
+            read -p "Select option (0-9, b, r): " choice
+
+            if ! [[ "$choice" =~ ^([0-9]|[bBrR])$ ]]; then
+                echo ""
+                cecho "${RED}Invalid choice. Please enter 0-9, b, or r${NC}"
+                echo ""
+                continue
+            fi
+            break
+        done
+
+        # Convert uppercase to lowercase for case statement
+        choice=${choice,,}
 
         case "$choice" in
             1)
@@ -1737,10 +1794,6 @@ main() {
                 cecho "${GREEN}Exiting PHP Optimizer...${NC}"
                 exit 0
                 ;;
-            *)
-                cecho "${RED}Invalid option${NC}"
-                sleep 1
-                ;;
         esac
     done
 }