Check for Palindrome string using PHP

The characters read the same backward as forward. Some examples of palindromic words are redivider, deified, civic, radar, level, rotor, kayak, reviver, racecar, redder, madam, and refer.

function palindrome($string)
{
    return strrev($string) == $string ? true : false;
} 

Results

echo palindrome('SOOS') == true ? 'This is Palindrome' : 'This is not Palindrome';

Output: This is Palindrome
Explanation: Reversing SOOS will also get SOOS

echo palindrome('SOOSS') == true ? 'This is Palindrome' : 'This is not Palindrome';

Output: This is not Palindrome
Explanation: Reversing SOOSS will get SSOOS