how to use extended ASCII instead of unicode in PHP

php visual-foxpro

PHP Snippet 1:

SUBSTR(key,1,1)

PHP Snippet 2:

$clAve[0]

PHP Snippet 3:

function Encripta($teXto){
    $clAve = ")&H%\$V1#@^+=?/><:MN*-";
    $teXtoenc = "";
    $c = 0;
    for($j = 0; $j < strlen($teXto); $j++){
        $leTra = (ord($teXto[$j]) + ord($clAve[$c])) % 256;
        $c ++;
        $teXtoenc .= chr($leTra);
        if($c >= strlen($clAve))
            $c = 0;
    }
    return $teXtoenc;
}
?>

PHP Snippet 4:

72 38 / 111 72 / 108 37 / 97 36

PHP Snippet 5:

72 41 / 111 38 / 108 72 / 97 37