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初学函数遇到一个小问题

WBOY
Release: 2016-06-23 13:25:20
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定义一个可以获取指定整数数组元素和的函数并调用。
我的代码是:
      function sum($str)
      {
             for($i=0;$i                      $sum=0;
                      $sum=$sum+$str[$i];
              }
              return $sum;
        }
        $a=array(7,9,8,5,3);
        sum($a);
?>
啥也没输出,傻眼了
        


回复讨论(解决方案)

<?php      function sum($str)      {     $sum=0;             for($i=0;$i<count($str);$i++){                      //$sum=0;                      $sum=$sum+$str[$i];              }              return $sum;//你这只是返回了值,没输出,        }        $a=array(7,9,8,5,3);        echo sum($a);?>
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