Palindrome (Reverse String)

<?php
$str = "Hello";

$rev = "";

$length = strlen($str);
for($i = $length-1; $i>=0; $i--){
    $rev .= $str[$i];
}

if($str == $rev){
    echo "$str is Palindrome";
}
else{
    echo "$str is not Palindrome";
}
?>

Insert string into Database

<?php

$str = "New Delhi@@Delhi,Lucknow##U.P,Patna&&Bihar";

$records = explode(",",$str);

foreach($records as $row){

     list($city, $state) = preg_split("/[@{2}#{2}&{2}]+/", $row);

     $sql = "INSERT INTO country(city, state) VALUES('".$city."', '".$state."')";

     echo $sql."<br/>";

    //mysql_query($sql);

}

?>