PHP array_flatten() function. Convert a multi-dimensional array into a single-dimensional array.

array_flatten.php

<?php 

/**
 * Convert a multi-dimensional array into a single-dimensional array.
 * @author Sean Cannon, LitmusBox.com | seanc@litmusbox.com
 * @param  array $array The multi-dimensional array.
 * @return array
 */
function array_flatten($array) { 
  if (!is_array($array)) { 
    return false; 
  } 
  $result = array(); 
  foreach ($array as $key => $value) { 
    if (is_array($value)) { 
      $result = array_merge($result, array_flatten($value)); 
    } else { 
      $result[$key] = $value; 
    } 
  } 
  return $result; 
}

$myarray = array('a', 'b', array(array(array('x'), 'y', 'z')), array(array('p')));

function array_flatten($array,$return) {
        if (!is_array($array)) { 
                return false; 
        } 
	for($x = 0; $x <= count($array); $x++) {
		if(is_array($array[$x])) {
			$return = array_flatten($array[$x], $return);
		}
		else {
			if(isset($array[$x])) {
				$return[] = $array[$x];
			}
		}
	}
	return $return;
}

$res = array_flatten($myarray, array());

function array_flatten($array = null) {
    $result = array();

    if (!is_array($array)) {
        $array = func_get_args();
    }

    foreach ($array as $key => $value) {
        if (is_array($value)) {
            $result = array_merge($result, array_flatten($value));
        } else {
            $result = array_merge($result, array($key => $value));
        }
    }

    return $result;
}