<?
$string = abcde;
echo "character 2: ". $string[2] . "\n";
$string[2] = "X";
echo "character 2: ". $string[2] . "\n";
$string[2] = "moreThanOneChar";
echo "character 2: ". $string[2] . "\n";

echo "Whole string: $string";
?>

character 2: c
character 2: X
character 2: m
Whole string: abmde