怎么循环输出含有tr的td

如何循环输出含有tr的td
eg:$arr1=array("a","b","c","d","e","f","g"); 
循环上面的。

得到如下效果

a
b
c
d


e
f
g



以此类推,请问如何用PHP写出来

------解决方案--------------------

PHP code

foreach(array_chunk($arr1,4) as $v){
      echo "<tr>\n";
    foreach($v as $t) echo "<td>".$t."</td>\n";
    echo "</tr>\n";
};
<br><font color="#e78608">------解决方案--------------------</font><br>$arr1=array("a","b","c","d","e","f","g"); <br><br>$i = 1;<br>echo '<tr>';<br>foreach ($arr1 as $key=>$val)<br>{<br>	echo '<td>' , $val, '</td>';<br>	if($i%4 == 0) echo "</tr><tr>";<br>	++$i;<br>}<br>echo '</tr>';<br><br> <div class="clear">
                 
              
              
        
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