PHP 数组函数 array_sum()

<?php
   $ba = array(2, 4, 6, 8);
   echo "sum(ba) = " . array_sum($ba);
   print "\n" ;

   $ab = array("a" => 1.2, "b" => 2.3, "c" => 3.4);
   echo "sum(ab) = " . array_sum($ab);
?>