title: Best way to compress string in PHP
body: <p>I am compressing the array with gzcompress(json_encode($arr),9).
  So I am converting array into string with json_encode and then compress with gzcompress.
  But I could not find the much difference in the size of the resulted string.
  Before compression size is 488 KB and after compression size is 442 KB.</p>
  
  <p>Is there any way I can compress the string further?</p>
  
  <p>Thanks in advance.</p>