Description:
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The class ReflectionFunctionAbstract isn't documented at all.  A comment to the ReflectionMethod class lets me to guess this class be defined as follows:

abstract class ReflectionFunctionAbstract
{
    private void function __clone()
    public string function getName()
    public bool function isInternal()
    public bool function isUserDefined()
    public string function getFileName()
    public int function getStartLine()
    public int function getEndLine()
    public string function getDocComment()
    public array[string]mixed function getStaticVariables()
    public bool function returnsReference()
    public array[int]ReflectionParameter function getParameters()
    public int function getNumberOfParameters()
    public int function getNumberOfRequiredParameters()
}

The comment inside ReflectionMethod

    // Inherited from ReflectionFunction

should the read

    // Inherited from ReflectionFunctionAbstract