PHP隔行换色输出几行几列表格。

<?php
$table = '';
function PrintTable($rows, $cols)
{
    global $table;
    $table .= "<table width='700' border='1'>";
    for ($i=1;$i<$rows;$i++) {
        $color = $i % 2 == 0 ? 'green' : 'orange';
        $table .= "<tr bgcolor='$color'>";
        for ($j=1;$j<$cols;$j++) {
            $table .="<td>xxoo</td>";
        }
        $table .= "</tr>";
    }
    $table .= "</table>";
    return $table;
}
echo PrintTable(10, 10);
?>