<?php

function isPalindrome($string=null)
{
  if($string === null)
    return 0;
  
  if(is_numeric($string))
    return 0;
  
  $string = preg_replace('/\s+/', '', $string);
  
  $reverse = strrev($string);
  
  if($reverse == $string)
    return 1;
  else
    return 0;

}

echo isPalindrome('lion oil');

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