根据大写字母分隔字符串

<code><?php $a = 'wordWordWordWordYelloHelloTest';

var_dump(preg_split('/(?=[A-Z])/', $a));

</code></code>

<code>array(7) {
  [0]=>
  string(4) "word"
  [1]=>
  string(4) "Word"
  [2]=>
  string(4) "Word"
  [3]=>
  string(4) "Word"
  [4]=>
  string(5) "Yello"
  [5]=>
  string(5) "Hello"
  [6]=>
  string(4) "Test"
}
</code>

<code><?php $str = "wordWordWordWord";
$splitChar = ",";
$formatStr = preg_replace("/([A-Z])/", ",\\1", $str);

$wordList = explode($splitChar, $formatStr);
print_r($wordList);
</code></code>