Convert numbers to uppercase

/**
*Convert numbers in php to uppercase numbers
*/
function numToChar($num) {
       $arr = array (                                                                                                                 ,
                                                     ',' 'Five',
'six',
'seven',
'eight',
'nine'
);
$ len = strlen ($ num); $len < 0) {
                                                                              substr ( $num, $i, 1 )];
}
return $return;
}

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The above introduces the conversion of numbers into uppercase, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.