title: Xoring Two characters in PHP?
body: <p>I was reading about xor in php , and I saw this example:</p>
  
  <pre><code>$aa = "A" ^ "}"; 
  echo $aa; // &lt;
  </code></pre>
  
  <p>So I search in internet about how it  works and they said its sum the ascii code , but the above code not sum.</p>
  
  <pre><code>A = 65
  } = 125 
  
  65 + 125 = 190
  </code></pre>
  
  <p>I tried to do sum between another chars like </p>
  
  <pre><code>$aa = "A" ^ "&amp;";
  echo $aa;
  </code></pre>
  
  <p>But the result is <code>130 = g</code></p>
  
  <p>so does any char above 97 not sum ?</p>
  
  <p>I also check this questions  <a href="https://stackoverflow.com/questions/34248684/php-xor-strings">PHP XOR strings</a> but it didn't help me.</p>