diff --git a/src/Peachpie.Runtime/Dynamic/BinderHelpers.cs b/src/Peachpie.Runtime/Dynamic/BinderHelpers.cs
index 4bdc314d47..7f904606c6 100644
--- a/src/Peachpie.Runtime/Dynamic/BinderHelpers.cs
+++ b/src/Peachpie.Runtime/Dynamic/BinderHelpers.cs
@@ -19,10 +19,34 @@ namespace Pchp.Core.Dynamic
     [DebuggerNonUserCode]
     internal static class BinderHelpers
     {
-        public static bool IsParamsParameter(this ParameterInfo p)
+        public static bool IsParamsParameter(this ParameterInfo p, out Type elementType)
         {
-            //TODO: [ParamCollectionAttribute] Span<T>
-            return p.ParameterType.IsArray && p.CustomAttributes.Any(attr => attr.AttributeType == typeof(ParamArrayAttribute));
+            if (p.ParameterType.IsArray)
+            {
+                // [ParamArray] T[]
+                if (p.CustomAttributes.Any(attr => attr.AttributeType == typeof(ParamArrayAttribute)))
+                {
+                    elementType = p.ParameterType.GetElementType();
+                    return true;
+                }
+            }
+            else if (p.ParameterType.IsConstructedGenericType && p.CustomAttributes.Any(attr => attr.AttributeType.Name == "ParamCollectionAttribute"))   // [ParamCollectionAttribute] Span<T>
+            {
+                var def_args = p.ParameterType.GenericTypeArguments;
+                if (def_args.Length == 1)
+                {
+                    var def = p.ParameterType.GetGenericTypeDefinition();
+                    if (def == typeof(Span<>) || def == typeof(ReadOnlySpan<>))
+                    {
+                        elementType = def_args[0]; // T
+                        return true;
+                    }
+                }
+            }
+
+            //
+            elementType = null;
+            return false;
         }
 
         /// <summary>
@@ -201,7 +225,7 @@ public static bool IsMandatoryParameter(this ParameterInfo p)
                 !p.HasDefaultValue && // CLR default value
                 !p.IsOptional && // has [Optional} attribute
                 p.GetCustomAttribute<DefaultValueAttribute>() == null && // has [DefaultValue] attribute
-                !p.IsParamsParameter(); // is params
+                !p.IsParamsParameter(out _); // is params
         }
 
         /// <summary>
@@ -1278,9 +1302,9 @@ public static Expression BindToCall(Expression instance, MethodBase method, Expr
 
                 // regular parameter:
 
-                if (i == ps.Length - 1 && p.IsParamsParameter())
+                if (i == ps.Length - 1 && p.IsParamsParameter(out var elementType))
                 {
-                    boundargs[i] = args.BindParams(argi, p.ParameterType.GetElementType());
+                    boundargs[i] = Expression.Convert(args.BindParamsArray(argi, elementType), p.ParameterType);
                 }
                 else
                 {
diff --git a/src/Peachpie.Runtime/Dynamic/CallBinder.cs b/src/Peachpie.Runtime/Dynamic/CallBinder.cs
index 6620daee86..c6e23b7eab 100644
--- a/src/Peachpie.Runtime/Dynamic/CallBinder.cs
+++ b/src/Peachpie.Runtime/Dynamic/CallBinder.cs
@@ -69,7 +69,7 @@ protected static bool IsClrMagicCallWithParams(MethodInfo method)
                 if (!method.DeclaringType.GetPhpTypeInfo().IsPhpType) // only methods declared outside PHP code
                 {
                     if (count > 2) return true;
-                    if (ps.Last().IsParamsParameter()) return true;
+                    if (ps.Last().IsParamsParameter(out _)) return true;
                 }
             }
 
diff --git a/src/Peachpie.Runtime/Dynamic/OverloadBinder.cs b/src/Peachpie.Runtime/Dynamic/OverloadBinder.cs
index 8662033f12..ff8b0714e6 100644
--- a/src/Peachpie.Runtime/Dynamic/OverloadBinder.cs
+++ b/src/Peachpie.Runtime/Dynamic/OverloadBinder.cs
@@ -287,7 +287,7 @@ protected ArgumentsBinder(Expression ctx)
             /// <summary>
             /// Bind arguments to array of parameters.
             /// </summary>
-            public abstract Expression BindParams(int fromarg, Type element_type);
+            public abstract Expression BindParamsArray(int fromarg, Type element_type);
 
             /// <summary>
             /// Gets expression representing cost of argument binding operation.
@@ -563,7 +563,7 @@ public override Expression BindWriteBack(int targetarg, Expression expression)
                     return Expression.Assign(element, ConvertExpression.Bind(expression, element.Type, _ctx));
                 }
 
-                public override Expression BindParams(int fromarg, Type element_type)
+                public override Expression BindParamsArray(int fromarg, Type element_type)
                 {
                     //if (element_type == _argsarray.Type.GetElementType())
                     //if (true)
@@ -778,7 +778,7 @@ public override Expression BindWriteBack(int targetarg, Expression expression)
                     return BinderHelpers.BindAssign(arg, expression, _ctx);
                 }
 
-                public override Expression BindParams(int fromarg, Type element_type)
+                public override Expression BindParamsArray(int fromarg, Type element_type)
                 {
                     var count = _args.Length - fromarg;
 
@@ -862,12 +862,10 @@ static Expression BindCostOf(MethodBase method, ArgumentsBinder args, BitArray c
             for (int im = 0; im < nmandatory + noptional; im++)
             {
                 var p = ps[nimplicit + im];
-                if (noptional != 0 && p.Position == ps.Length - 1 && p.IsParamsParameter())
+                if (noptional != 0 && p.Position == ps.Length - 1 && p.IsParamsParameter(out var element_type))
                 {
                     hasparams = true;
 
-                    var element_type = p.ParameterType.GetElementType();
-
                     // for (int o = io + nmandatory; o < argc; o++) result |= CostOf(argv[o], p.ElementType)
                     if (argc_opt.HasValue)
                     {