<?php

/*
 * Demonstration of how to flatten an array of arbitrarily nested arrays.
 * No error checking is done here.  This assumes that the test array ($myarray) is properly formed.
 */

echo 'hello<br>';

// Some test data
$myarray =  array(  1,
                    2,
                    3.4,
                    4,
                    'mikey',
                     array(  4,
                             5,
                             array(  99,
                                    88)
                                  ),
                             6
                 );

// Something to hold the results
$result = Array();

// let's get started
echo 'Initial array:<br>';
print_r($myarray);

flatten($myarray, $result);

echo '<br><br>Result array:<br>';
print_r($result);


/*
 * Flattens an array of arbitrarily-nested arrays.
 * While the instruction stated integer-only values would be used, this function flattens arrays regardless of their content.
 *
 * Parameters:
 * $input - the value to be checked/flattened
 * $result - passed by reference, a place to hold the results.
 */

function flatten($input, &$result) {

    if(gettype($input) == 'array')
    {
        // if the input is an array, continue to flatten
        foreach($input as $key=>$value){
            flatten($value, $result);
        }
    } else {
        // Assign value to result array
        $result[] = $input;
    }
    // nothing to return
}
?>