test file

gistfile1.php

<?php
/**
 * @author mschultheiss83
 * https://github.com/mschultheiss83
 */ 

/**
 * @param array $arrData
 * @param bool $bIncludeHeader
 * @return string
 */
function array_2_csv($arrData = array(), $bIncludeHeader = false ) {
    $csv = array();
    if ($bIncludeHeader) {
        $csv[] = array_2_csv(array_keys($arrData));
    }

    foreach ($arrData as $item) {
        if (is_array($item)) {
            $csv[] = array_2_csv($item);
        } else {
            $csv[] = $item;
        }
    }
    return implode(';', $csv);
}