Form hidden fields equivalent of http_build_query

html_build_form.php

/**
 * First draft of sister function http_build_query http://php.net/manual/function.http-build-query.php
 * intended to generate hidden form inputs from the *same* arguments
 */

function html_build_form(array $array, $prefix = '') {
    $str = '';
    foreach($array as $key => $val) {
        $name = $prefix?$prefix.'['.$key.']':$key;
        if(is_array($val)) $str .= html_build_form($val, $name);
        else {
            $str .= '<input type="hidden" name="'.htmlentities($name).'" value="'.htmlentities($val).'">'; // use htmlentities($name,ENT_COMPAT,'UTF-8'); if server encoding differs from text
        }
    }
    return $str;
}