/// <summary>
/// Verifies that the contents of a variable can be called as a function.
/// </summary>
/// <param name="ctx">Current runtime context.</param>
/// <param name="variable">The variable.</param>
/// <param name="syntaxOnly">If <B>true</B>, it is only checked that has <pararef name="variable"/>
/// a valid structure to be used as a callback. if <B>false</B>, the existence of the function (or
/// method) is also verified.</param>
/// <param name="callableName">Receives the name of the function or method (for example
/// <c>SomeClass::SomeMethod</c>).</param>
/// <returns><B>true</B> if <paramref name="variable"/> denotes a function, <B>false</B>
/// otherwise.</returns>
public static bool is_callable(Context ctx /*, caller*/, PhpValue variable, bool syntaxOnly, out string callableName)
{
var callback = variable.AsCallable();
if (PhpVariable.IsValidCallback(callback))
{
callableName = callback.ToString();
return(true);
}
callableName = variable.ToString(ctx);
return(false);
}
/// <summary>
/// Verifies that the contents of a variable can be called as a function.
/// </summary>
/// <param name="ctx">Current runtime context.</param>
/// <param name="callerCtx">Type of the current calling context.</param>
/// <param name="variable">The variable.</param>
/// <param name="syntaxOnly">If <B>true</B>, it is only checked that has <pararef name="variable"/>
/// a valid structure to be used as a callback. if <B>false</B>, the existence of the function (or
/// method) is also verified.</param>
/// <param name="callableName">Receives the name of the function or method (for example
/// <c>SomeClass::SomeMethod</c>).</param>
/// <returns><B>true</B> if <paramref name="variable"/> denotes a function, <B>false</B>
/// otherwise.</returns>
public static bool is_callable(Context ctx, [ImportCallerClass] RuntimeTypeHandle callerCtx, PhpValue variable, bool syntaxOnly, out string callableName)
{
var callback = variable.AsCallable(callerCtx);
if (PhpVariable.IsValidCallback(callback))
{
callableName = callback.ToString();
return(true);
}
callableName = variable.ToString(ctx);
return(false);
}
/// <summary>
/// Verifies that the contents of a variable can be called as a function.
/// </summary>
/// <param name="ctx">Runtime context.</param>
/// <param name="variable">The variable.</param>
/// <param name="syntaxOnly">If <B>true</B>, it is only checked that has <pararef name="variable"/>
/// a valid structure to be used as a callback. if <B>false</B>, the existence of the function (or
/// method) is also verified.</param>
/// <returns><B>true</B> if <paramref name="variable"/> denotes a function, <B>false</B>
/// otherwise.</returns>
public static bool is_callable(Context ctx, IPhpCallable variable, bool syntaxOnly = false)
{
return(syntaxOnly
? PhpVariable.IsValidCallback(variable)
: PhpVariable.IsValidBoundCallback(ctx, variable));
}
/// <summary>
/// Verifies that the contents of a variable can be called as a function.
/// </summary>
/// <param name="variable">The variable.</param>
/// <param name="syntaxOnly">If <B>true</B>, it is only checked that has <pararef name="variable"/>
/// a valid structure to be used as a callback. if <B>false</B>, the existence of the function (or
/// method) is also verified.</param>
/// <returns><B>true</B> if <paramref name="variable"/> denotes a function, <B>false</B>
/// otherwise.</returns>
public static bool is_callable(PhpValue variable, bool syntaxOnly = false)
{
return(PhpVariable.IsValidCallback(variable.AsCallable())); // TODO: check syntaxOnly || can be bound
}