Online PHP editor | output for UUSa6

@ 2014-10-10T15:09:20Z

<?php

function nth_position($str, $letter, $n, $offset = 0){
    $str_arr = str_split($str);
    $letter_size = array_count_values(str_split(substr($str, $offset)));
    if( !isset($letter_size[$letter])){
        trigger_error('letter "' . $letter . '" does not exist in ' . $str . ' after ' . $offset . '. position', E_USER_WARNING);
        return false;
    } else if($letter_size[$letter] < $n) {
        trigger_error('letter "' . $letter . '" does not exist ' . $n .' times in ' . $str . ' after ' . $offset . '. position', E_USER_WARNING);
        return false;
    }
    for($i = $offset, $x = 0, $count = (count($str_arr) - $offset); $i < $count, $x != $n; $i++){
        if($str_arr[$i] == $letter){
            $x++;
        }
    }
    return $i - 1;
}

echo nth_position('foobarbaz', 'a', 2); //7
echo nth_position('foobarbaz', 'b', 1, 4); //6

Output for 5.0.0 - 5.0.5, 5.1.1, 5.1.3 - 5.1.4, 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 76
Output for 5.1.2, 5.1.5: //676
Output for 5.1.0: Fatal error: fatal flex scanner internal error--end of buffer missed in /in/UUSa6 on line 22
Process exited with code 255.
Output for 4.4.5 - 4.4.9: Fatal error: Call to undefined function: str_split() in /in/UUSa6 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.1, 4.4.3 - 4.4.4: Fatal error: Call to undefined function: str_split() in /in/UUSa6 on line 4
Process exited with code 255.
Output for 4.4.2: //6 Fatal error: Call to undefined function: str_split() in /in/UUSa6 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1: Fatal error: Call to undefined function: str_split() in /in/UUSa6 on line 4

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