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Lua::registerCallback — Register a PHP function to Lua
Register a PHP function to Lua as a function named "$name"
name
functionA valid PHP function callback
   Returns $this, NULL for wrong arguments or FALSE on
   other failure.
  
Example #1 Lua::registerCallback()example
<?php
$lua = new Lua();
$lua->registerCallback("echo", "var_dump");
$lua->eval(<<<CODE
    echo({1, 2, 3});
CODE
);
?>
The above example will output:
array(3) {
  [1]=>
  float(1)
  [2]=>
  float(2)
  [3]=>
  float(3)
}