การสร้างฟังก์ชันแบบเรียกตัวเอง (recursive function)

?>

function binSearch(&$key,&$array, $left, $right)
{
$mid = ceil( ($left + $right) / 2 );

if ($left > $right)
return -1;
if ($array[$mid] == $key)
return $mid;
else if ($key < $array[$mid])
return binSearch($key, $array, $left, $mid-1); // recursive call
else
return binSearch($key, $array, $mid+1, $right); // recursive call
}

$num=100;
$key = randInt(0, $num);
for($i=0; $i < $num; $i++) {
$sorted_array[$i] = $i+1;
}

echo binSearch(13, $sorted_array, 0, $num);

?>

function randomToken($len) {
srand( date(“s”) );
$chars = “ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz”;
$chars.= “1234567890!@#$%^&*()”;
$ret_str = “”;
$num = strlen($chars);
for($i=0; $i < $len; $i++) {
$ret_str.= $chars[rand()%$num];
}
return $ret_str;
}

echo randomToken(13),” “;

?>