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Configuration of array_walk()

<?php
/**
 * PHP By Example
 *
 * @copyright 2014 Michel Corne 
 * @license   http://www.opensource.org/licenses/gpl-3.0.html GNU GPL v3
 */

require_once 'models/function_core.php';

/**
 * Function configuration
 *
 * Changes to this class may affect other classes.
 *
 * @see docs/function-configuration.txt
 */

class array_walk extends function_core
{
    public 
$examples = [
        [
            
'__array' => [
                
"d" => "lemon",
                
"a" => "orange",
                
"b" => "banana",
                
"c" => "apple"
            
],
            
'$array',
            
'test_print'
        
],
        [
            
'__array' => [
                
"d" => "lemon",
                
"a" => "orange",
                
"b" => "banana",
                
"c" => "apple"
            
],
            
'$array',
            
'test_alter',
            
'fruit'
        
],
    ];

    public 
$helper_callbacks = ['index_in_example' => 1];

    public 
$input_args '__array';

    public 
$source_code '
        // custom callback functions
        function test_alter(&$item1, $key, $prefix) { $item1 = "$prefix: $item1"; };
        function test_print(&$item, $key)           { $item = "$key holds $item\n"; };

        $_array =
            $__array; // array $__array

        inject_function_call
    '
;

    public 
$synopsis 'bool array_walk ( array &$array , callable $callback [, mixed $userdata = NULL ] )';

    function 
pre_exec_function()
    {
        
$this->_filter->filter_callback('callback');
    }
}