diff --git a/modules/quercus/src/com/caucho/quercus/env/StringBuilderValue.java b/modules/quercus/src/com/caucho/quercus/env/StringBuilderValue.java
index f6c1540..9ed635e 100644
--- a/modules/quercus/src/com/caucho/quercus/env/StringBuilderValue.java
+++ b/modules/quercus/src/com/caucho/quercus/env/StringBuilderValue.java
@@ -407,6 +407,10 @@ public class StringBuilderValue
       i++;
     }
 
+    if (i < (len - 2) && buffer[i] == '0' && buffer[i+1] == 'x') {
+      return (double) parseLong(buffer, offset, len);
+    }
+
     if (i < len && ((ch = buffer[i]) == '+' || ch == '-')) {
       i++;
     }
diff --git a/modules/quercus/src/com/caucho/quercus/env/StringValue.java b/modules/quercus/src/com/caucho/quercus/env/StringValue.java
index b2f11c8..e6360d5 100644
--- a/modules/quercus/src/com/caucho/quercus/env/StringValue.java
+++ b/modules/quercus/src/com/caucho/quercus/env/StringValue.java
@@ -346,20 +346,42 @@ abstract public class StringValue
       offset++;
     }
 
+    int base = 10;
     while (offset < end) {
       int ch = buffer[offset++];
 
+      if (ch == 'x' && value == 0) {
+        // hex encoded number 0xABCD
+        base = 16;
+        continue;
+      }
       if ('0' <= ch && ch <= '9') {
-        long newValue = 10 * value + ch - '0';
+        long newValue = base * value + ch - '0';
+        if (newValue < value) {
+          // long value overflowed, set result to integer max
+          result = Integer.MAX_VALUE;
+          isResultSet = true;
+          break;
+        }
+        value = newValue;
+      }
+      else if (base == 16 && 'a' <= ch && ch <= 'f') {
+        long newValue = base * value + ch - 'a' + 10;
         if (newValue < value) {
-          // php/0143
-          // long value overflowed
           result = Integer.MAX_VALUE;
           isResultSet = true;
           break;
         }
         value = newValue;
       }
+      else if (base == 16 && 'A' <= ch && ch <= 'F') {
+        long newValue = base * value + ch - 'A' + 10;
+        if (newValue < value) {
+          result = Integer.MAX_VALUE;
+          isResultSet = true;
+          break;
+        }
+      }
       else {
         result = sign * value;
         isResultSet = true;
@@ -398,11 +420,17 @@ abstract public class StringValue
       offset++;
     }
 
+    int base = 10;
     while (offset < end) {
       int ch = buffer[offset++];
 
+      if (ch == 'x' && value == 0) {
+        // hex encoded number 0xABCD
+        base = 16;
+        continue;
+      }
       if ('0' <= ch && ch <= '9') {
-        long newValue = 10 * value + ch - '0';
+        long newValue = base * value + ch - '0';
         if (newValue < value) {
           // long value overflowed, set result to integer max
           result = Integer.MAX_VALUE;
@@ -411,6 +439,24 @@ abstract public class StringValue
         }
         value = newValue;
       }
+      else if (base == 16 && 'a' <= ch && ch <= 'f') {
+        long newValue = base * value + ch - 'a' + 10;
+        if (newValue < value) {
+          result = Integer.MAX_VALUE;
+          isResultSet = true;
+          break;
+        }
+        value = newValue;
+      }
+      else if (base == 16 && 'A' <= ch && ch <= 'F') {
+        long newValue = base * value + ch - 'A' + 10;
+        if (newValue < value) {
+          result = Integer.MAX_VALUE;
+          isResultSet = true;
+          break;
+        }
+        value = newValue;
+      }
       else {
         result = sign * value;
         isResultSet = true;
@@ -452,11 +498,17 @@ abstract public class StringValue
       offset++;
     }
 
+    int base = 10;
     while (offset < end) {
       int ch = string.charAt(offset++);
 
+      if (ch == 'x' && value == 0) {
+        // hex encoded number 0xABCD
+        base = 16;
+        continue;
+      }
       if ('0' <= ch && ch <= '9') {
-        long newValue = 10 * value + ch - '0';
+        long newValue = base * value + ch - '0';
         if (newValue < value) {
           // long value overflowed, set result to integer max
           result = Integer.MAX_VALUE;
@@ -465,6 +517,23 @@ abstract public class StringValue
         }
         value = newValue;
       }
+      else if (base == 16 && 'a' <= ch && ch <= 'f') {
+        long newValue = base * value + ch - 'a' + 10;
+        if (newValue < value) {
+          result = Integer.MAX_VALUE;
+          isResultSet = true;
+          break;
+        }
+        value = newValue;
+      }
+      else if (base == 16 && 'A' <= ch && ch <= 'F') {
+        long newValue = base * value + ch - 'A' + 10;
+        if (newValue < value) {
+          result = Integer.MAX_VALUE;
+          isResultSet = true;
+          break;
+        }
+      }
       else {
         result = sign * value;
         isResultSet = true;