title: PHP: How to convert bigint from int to string?
body: <p>I want to be able to convert big ints into their full string derivatives.</p>
  
  <p>For example.</p>
  
  <pre><code>$bigint = 9999999999999999999;
  $bigint_string = (string) $bigint;
  var_dump($bigint_string);
  </code></pre>
  
  <p>outputs</p>
  
  <pre><code>string(7) "1.0e+19"
  </code></pre>
  
  <p>but i need</p>
  
  <pre><code>string(19) "9999999999999999999"
  </code></pre>
  
  <p>Please don't tell me that I should just originally set the $bigint value as a string. That is not an option. I really am stuck and don't know if it is even possible?</p>