(PECL apd >= 0.2)
rename_function — Renames orig_name to new_name in the global function table
$original_name
   , string $new_name
   )Renames a orig_name to new_name in the global function table. Useful for temporarily overriding built-in functions.
original_nameThe original function name.
new_name
       The new name for the original_name function.
      
   Returns TRUE on success or FALSE on failure.
  
Example #1 rename_function() example
<?php
rename_function('mysql_connect', 'debug_mysql_connect' );
?>