palindrome words program in php

Question

there is a String 'S', program is to find and print whether this string is a palindrome or not. If yes, print "YES", else print "NO"

for some palindrome words it is working like civic and for some it is not working code:-

<?php
$str = "Civic";

$count =  ((strlen($str)+1 ) /2);
$q = "y";
for($i = 0; $i < $count; $i++)
{   
    $x = 1;
    $z = $str[(strlen($str-$x))];
    $x = $x+1;
    if($str[$i] == $z ) {
        $x = $x++;
        $q = "y";
    } else {
        $q = "n";  
    }
}
if($q == "n") {
    echo "No";
} else {
    echo "Yes";
}   
?>

Please give me some suggestions about my code, Thanks

Answer 1

How about a different approach:

if($str == strrev($str)) {
    echo "Yes";
} else {
    echo "No";
}

Or shorter:

echo ($str == strrev($str)) ? "Yes" : "No";

But maybe the problem is case sensitivity?

echo (strtolower($str) == strrev(strtolower($str))) ? "Yes" : "No";