diff --git a/duchain/builders/declarationbuilder.h b/duchain/builders/declarationbuilder.h
--- a/duchain/builders/declarationbuilder.h
+++ b/duchain/builders/declarationbuilder.h
@@ -145,6 +145,8 @@
     KDevelop::FunctionType::Ptr m_currentFunctionType;
     /// The AstNode of the previous function declaration argument
     ParameterAst *m_functionDeclarationPreviousArgument;
+    /// The AstNode of the previous function call argument
+    FunctionCallParameterListElementAst *m_functionCallPreviousArgument;
 
     unsigned int m_currentModifers;
     QString m_lastTopStatementComment;
diff --git a/duchain/builders/declarationbuilder.cpp b/duchain/builders/declarationbuilder.cpp
--- a/duchain/builders/declarationbuilder.cpp
+++ b/duchain/builders/declarationbuilder.cpp
@@ -1217,12 +1217,10 @@
 
 void DeclarationBuilder::visitFunctionCallParameterList(FunctionCallParameterListAst* node)
 {
-    int oldPos = m_functionCallParameterPos;
-    m_functionCallParameterPos = 0;
+    PushValue<FunctionCallParameterListElementAst*> push(m_functionCallPreviousArgument, 0);
+    PushValue<int> pos(m_functionCallParameterPos, 0);
 
     DeclarationBuilderBase::visitFunctionCallParameterList(node);
-
-    m_functionCallParameterPos = oldPos;
 }
 
 void DeclarationBuilder::visitFunctionCallParameterListElement(FunctionCallParameterListElementAst* node)
@@ -1245,6 +1243,12 @@
         }
     }
 
+    if (m_functionCallPreviousArgument && m_functionCallPreviousArgument->isVariadic != -1 && node->isVariadic == -1) {
+        reportError(i18n("Cannot use positional argument after argument unpacking"), node);
+    }
+
+    m_functionCallPreviousArgument = node;
+
     ++m_functionCallParameterPos;
 }
 
diff --git a/duchain/tests/duchain.h b/duchain/tests/duchain.h
--- a/duchain/tests/duchain.h
+++ b/duchain/tests/duchain.h
@@ -153,6 +153,7 @@
     void useThisAsArray();
     void wrongUseOfThisAsArray();
     void staticFunctionClassPhp54();
+    void functionArgumentUnpacking();
 };
 
 }
diff --git a/duchain/tests/duchain.cpp b/duchain/tests/duchain.cpp
--- a/duchain/tests/duchain.cpp
+++ b/duchain/tests/duchain.cpp
@@ -3044,3 +3044,22 @@
     ClassDeclaration* classDec = dynamic_cast<ClassDeclaration*>(dec);
     QCOMPARE(classDec->uses().count(),1);
 }
+
+void TestDUChain::functionArgumentUnpacking()
+{
+    //                 0         1         2         3         4         5         6         7
+    //                 01234567890123456789012345678901234567890123456789012345678901234567890123456789
+    QByteArray method("<?php\n"
+                      "$a = [ 1,2 ];\n"
+                      "$b = [ 3,4 ];\n"
+                      "function aaa($c,$d,$e,$f) { }\n"
+                      "aaa(...$a, ...$b);\n");
+
+    TopDUContext* top = parse(method);
+    QVERIFY(top);
+    DUChainReleaser releaseTop(top);
+    DUChainWriteLocker lock(DUChain::lock());
+
+    QVERIFY(top->problems().isEmpty());
+    QCOMPARE(top->localDeclarations().count(),3);
+}
diff --git a/duchain/tests/expressionparser.h b/duchain/tests/expressionparser.h
--- a/duchain/tests/expressionparser.h
+++ b/duchain/tests/expressionparser.h
@@ -64,6 +64,7 @@
     void classNameConstant();
     void invalidVariadicFunction_data();
     void invalidVariadicFunction();
+    void invalidArgumentUnpacking();
 };
 
 }
diff --git a/duchain/tests/expressionparser.cpp b/duchain/tests/expressionparser.cpp
--- a/duchain/tests/expressionparser.cpp
+++ b/duchain/tests/expressionparser.cpp
@@ -681,5 +681,18 @@
     QVERIFY(!top->problems().isEmpty());
 }
 
+void TestExpressionParser::invalidArgumentUnpacking()
+{
+    //                 0         1         2         3         4         5         6         7
+    //                 01234567890123456789012345678901234567890123456789012345678901234567890123456789
+    QByteArray method("<? function foo($a, $b, $c){}; $d = [ 1, 2 ]; foo(...$d, $e);");
+
+    TopDUContext* top = parse(method, DumpNone);
+    DUChainReleaser releaseTop(top);
+    DUChainWriteLocker lock;
+
+    QVERIFY(!top->problems().isEmpty());
+}
+
 }
 
diff --git a/parser/php.g b/parser/php.g
--- a/parser/php.g
+++ b/parser/php.g
@@ -599,7 +599,7 @@
     #parameters=functionCallParameterListElement @ COMMA | 0
 -> functionCallParameterList ;;
 
-    (BIT_AND variable=variable) | expr=expr
+    (BIT_AND variable=variable) | (isVariadic=ELLIPSIS variable=variable) | expr=expr
 -> functionCallParameterListElement ;;
 
     #element=assignmentListElement @COMMA