php通过array_unshift函数添加多个变量到数组前端的方法

<?php
$alpha = array("a", "b", "c");
$final = array_unshift($alpha, "d","e");
print "There are $total elements in \$alpha<p>";
foreach ( $alpha as $val ) {
 print "$val<br/>";
}
print "</p>";
?>