Modulo colorido

<?php

$a = array_fill(1,10,'operand');

foreach($a as $key=>$valor){
    if($key%2 == 1):
        print "<span style=\"color:red;\">$valor</span><br/>";
    else:
        print "<span style=\"color:black;\">$valor</span><br/>";
    endif;
}

print "<hr>";

foreach($a as $key=>$valor){
    if($key%2 == 1):
        $class = "colorido";
    else:
        $class = "";
    endif;

    print "<span class=\"{$class}\">$valor</span><br/>";
}

?>
<style type="text/css">
.colorido {color:violet;}
</style>

?>