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// preg_replace capitalize a letter

$str = 'JAMES "JIMMY" SMITH';
echo preg_replace_callback(
  '/\b[a-z]/', 
  function ($matches) {
    return strtoupper($matches[0]);
  }, 
  $str
);

// http://stackoverflow.com/questions/2638288/preg-replace-to-capitalize-a-letter-after-a-quote