PHP 按字母输出问题

[sa111]

$grade = array("name" => array("Zhang San", "Li Si", "Wang Wu","Zhao Liu", "Liu Qi"));
array_multisort($grade["name"], SORT_STRING, SORT_ASC);
print_r($grade);

上面数组如何输出下面格式：

<div>
<ul>
<span>L</span>
<li>Li Si</li>
<li>Liu Qi</li>
</ul>
</div>

<div>
<ul>
<span>W</span>
<li>Wang Wu</li>
</ul>
</div>


<div>
<ul>
<span>Z</span>
<li>Zhang San</li>
<li>Zhao Liu</li>
</ul>
</div>

[xuzuning]

$grade = array("name" => array("Zhang San", "Li Si", "Wang Wu","Zhao Liu", "Liu Qi"));
foreach($grade["name"] as $v) $r[$v{0}][] = $v;
array_multisort(array_keys($r), SORT_STRING, SORT_ASC, $r);
print_r($r);

foreach($r as $k=>$c) {
  echo "<div>" . PHP_EOL;
  echo "<ul>" . PHP_EOL;
  echo "<span>$k</span>" . PHP_EOL;
  foreach($c as $v) {
    echo "<li>$v</li>" . PHP_EOL;
  }
  echo "</ul>" . PHP_EOL;
  echo "</div>" . PHP_EOL;
}

<div>
<ul>
<span>L</span>
<li>Li Si</li>
<li>Liu Qi</li>
</ul>
</div>
<div>
<ul>
<span>W</span>
<li>Wang Wu</li>
</ul>
</div>
<div>
<ul>
<span>Z</span>
<li>Zhang San</li>
<li>Zhao Liu</li>
</ul>
</div>