method_exists
    (PHP 4, PHP 5)
method_exists -- Checks if the class method exists
Description
bool 
method_exists ( object object, string method_name )
     This function returns TRUE if the method given by
     method_name has been defined for the given
     object, FALSE otherwise.
    
     
Example 1. method_exists() example 
<?php $directory = new Directory('.'); var_dump(method_exists($directory,'read')); ?>
 |  
 The above example will output:  | 
    
     See also function_exists() and 
     is_callable().