Register a PHP function to Lua

# Lua::registerCallback

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Lua::registerCallback — Register a PHP function to Lua

### Description

public Lua::registerCallback(string `$name`, callable `$function`): mixed

Register a PHP function to Lua as a function named "$name"

### Parameters

`name`
`function`
  A valid PHP function callback

### Return Values

Returns $this, `null` for wrong arguments or `false` on other failure.

### Examples

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)
    }

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