もっと良い方法があるかどうかを確認してください

<br />$testStr = 'rewruo ewjrewm' . PHP_EOL . 'hcywer国bg gfaaf d中国国国s国rew';<br />$testStr = preg_replace('/\s/', '', $testStr);<br />preg_match_all('/./u', $testStr, $strList);<br />$charCount = array_count_values($strList[0]);<br />arsort($charCount);<br />$maxCount = current($charCount);<br />foreach($charCount as $char => $count){<br />	if($count < $maxCount){<br />		break;<br />	}<br />	echo $char . '出现了 ' . $count . ' 次<br />';<br />}<br />

$testStr = 'rewruo ewjrewm' . PHP_EOL . 'hcywer国bg gfaaf d中国国国s国rew';<br />$testStr = preg_replace('/\s/', '', $testStr);<br />preg_match_all('/./u', $testStr, $strList);<br />$strList = array_count_values($strList[0]);<br />$r = array_keys($strList, $m = max($strList));<br />echo join($t=" 出现了 $m 次<br />", $r).$t;<br />