Find and replace duplicates in Array

Question

I need to make app with will fill array with some random values, but if in array are duplicates my app not working correctly. So I need to write script code which will find

Answer 1

Here the example how to generate unique values and replace recurring values in array

function get_unique_val($val, $arr) {
    if ( in_array($val, $arr) ) {
        $d = 2; // initial prefix 
        preg_match("~_([\d])$~", $val, $matches); // check if value has prefix
        $d = $matches ? (int)$matches[1]+1 : $d;  // increment prefix if exists

        preg_match("~(.*)_[\d]$~", $val, $matches);

        $newval = (in_array($val, $arr)) ? get_unique_val($matches ? $matches[1].'_'.$d : $val.'_'.$d, $arr) : $val;
        return $newval;
    } else {
        return $val;
    }
}

function unique_arr($arr) {
    $_arr = array();
    foreach ( $arr as $k => $v ) {
        $arr[$k] = get_unique_val($v, $_arr);
        $_arr[$k] = $arr[$k];
    }
    unset($_arr);

    return $arr;
}




$ini_arr = array('dd', 'ss', 'ff', 'nn', 'dd', 'ff', 'vv', 'dd');

$res_arr = unique_arr($ini_arr); //array('dd', 'ss', 'ff', 'nn', 'dd_2', 'ff_2', 'vv', 'dd_3');

Full example you can see here webbystep.ru