diff --git a/lib/php-analyzer.sh b/lib/php-analyzer.sh
index 7ac49ce..293b055 100644
--- a/lib/php-analyzer.sh
+++ b/lib/php-analyzer.sh
@@ -3,10 +3,22 @@
 # Part of Server Toolkit - Phase 2: Analysis
 # Dependencies: lib/php-detector.sh, lib/system-detect.sh
 
-# Source required libraries
-_LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-source "$_LIB_DIR/php-detector.sh" 2>/dev/null || { echo "ERROR: php-detector.sh not found"; return 1; }
-source "$_LIB_DIR/system-detect.sh" 2>/dev/null || { echo "ERROR: system-detect.sh not found"; return 1; }
+# Source guard - prevent re-sourcing (but allow re-initialization if needed)
+if [ -n "${_PHP_ANALYZER_LOADED:-}" ]; then
+    return 0
+fi
+readonly _PHP_ANALYZER_LOADED=1
+
+# Source required libraries only if not already loaded
+if [ -z "${_PHP_DETECTOR_LOADED:-}" ]; then
+    _LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+    source "$_LIB_DIR/php-detector.sh" 2>/dev/null || { echo "ERROR: php-detector.sh not found"; return 1; }
+fi
+
+if [ -z "${_SYSTEM_DETECT_LOADED:-}" ]; then
+    _LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+    source "$_LIB_DIR/system-detect.sh" 2>/dev/null || { echo "ERROR: system-detect.sh not found"; return 1; }
+fi
 
 # ============================================================================
 # HELPER FUNCTIONS - PURE BASH OPTIMIZATIONS
diff --git a/lib/php-calculator-improved.sh b/lib/php-calculator-improved.sh
index b33350f..ca60dd4 100644
--- a/lib/php-calculator-improved.sh
+++ b/lib/php-calculator-improved.sh
@@ -9,10 +9,22 @@
 #   - Safe allocation buffers based on traffic stability
 ################################################################################
 
-# Dependencies
-_LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-source "$_LIB_DIR/php-detector.sh" 2>/dev/null || { echo "ERROR: php-detector.sh not found"; return 1; }
-source "$_LIB_DIR/system-detect.sh" 2>/dev/null || { echo "ERROR: system-detect.sh not found"; return 1; }
+# Source guard - prevent re-sourcing
+if [ -n "${_PHP_CALCULATOR_LOADED:-}" ]; then
+    return 0
+fi
+readonly _PHP_CALCULATOR_LOADED=1
+
+# Dependencies - only source if not already loaded
+if [ -z "${_PHP_DETECTOR_LOADED:-}" ]; then
+    _LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+    source "$_LIB_DIR/php-detector.sh" 2>/dev/null || { echo "ERROR: php-detector.sh not found"; return 1; }
+fi
+
+if [ -z "${_SYSTEM_DETECT_LOADED:-}" ]; then
+    _LIB_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+    source "$_LIB_DIR/system-detect.sh" 2>/dev/null || { echo "ERROR: system-detect.sh not found"; return 1; }
+fi
 
 # ============================================================================
 # HELPER FUNCTION - Extract field from pipe-delimited string