如何使用PHP添加空div

我用PHP在三页上有27条记录。在每一页上，我都在交叉方向上添加了一个空格，如下图所示

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正如我认为你的愿望输出所有3页

那么，问题是什么呢？它不显示3,5和7记录@u_mulderRemove else并始终输出代码。答案几乎正确，但3,5,7记录无法显示

$keys = 1;
foreach ($fetrecords as $recVals) {
    if ($keys == 3 || $keys == 5 || $keys == 7) {    
        echo '<div id = "emptydiv">test</div>';
    } else {    
        echo '<div id = "mainarticles">code</div>';
    }

    $keys++;
}

<?php
$keys=1;

foreach($fetrecords as $recVals):

    if($keys == 3 || $keys == 5 || $keys == 7):
        echo '<div id="emptydiv">test</div>';
    else :
        echo '<div id="mainarticles">code</div>';
    endif

    $keys++;

    if($keys == 8)
        $keys = 1;

endforeach;
?>