Notice: Uninitialized string offset in PHP

Question

Hi I have this function and it returning a notice:

Notice: Uninitialized string offset

function generaterandomkey($length) {       

    $string=\'\'         


        

Answer 1

the best way : convert your string expression to array and then convert to string like this:

function readnumber know a number with any length:

function readnumber($str, $i) 
{
    $string=$str;
    $number = '';
    $s="";
    for($j=0;$jis_number($s[$i]))
        $number .= $s[$i++];        
    return $number;
}

can use it like this:

$str="154+458-8";
$number=readnumber($str,1);
echo($number);