尝试在while循环中使用foreach循环，不断获得无限循环 - Trying to use foreach loop inside while loop, keep getting infinite loop

Trying to use foreach loop inside while loop, keep getting infinite loop

本文关键字：循环无限循环 foreach while | 更新日期: 2023-09-27

我对PHP还很陌生，所以我想知道是否可以得到一些帮助？我应该通过使用while循环和foreach循环来迭代关联数组来创建图表。但我一直得到一个无限循环，我不完全确定如何修复它。我还怀疑if语句条件没有帮助，但我也不知道。我错过了什么？有更好的方法吗？

这是有问题的代码：

<?php
 include 'davesinventory.php';
 $delimiter = " 'n";
 $inventory['name'] = rtrim(strtok($data, $delimiter));
 $inventory['year'] = rtrim(strtok($delimiter));
 $inventory['serial'] = rtrim(strtok($delimiter));
 $inventory['seats'] = rtrim(strtok($delimiter));
 $inventory['charge'] = rtrim(strtok($delimiter));
 $inventory['days'] = rtrim(strtok($delimiter));
 $inventory['rev'] = rtrim(strtok($delimiter));
 $inventory['orig'] = rtrim(strtok($delimiter));
 $inventory['miles'] = rtrim(strtok($delimiter));
 $inventory['deprec'] = rtrim(strtok($delimiter));
 $inventory['freq'] = rtrim(strtok($delimiter));
 printf("<b> VEHICLE'tYEAR't SERIAL#'t RENT COST't DAYS OUT't REVENUE't ORIG. PRICE't MILEAGE't NOTES'n</b>");
?>
<hr>
<?php
 while($inventory['name']){
   foreach($inventory as $key => $vehicles){
         if ($key !== ['seats'] || ['deprec'] || ['freq'])
          {
             print $vehicles;
          }
          else if($key == ['seats'] || ['deprec'] || ['freq'])
          {
            echo " ";
          }
   }
}
?>
<pre>

这是"include"调用的文件：

<?php
$data =
"DodgeAvenger 2006 DA111-9 4 35.50 105 3727.50 21297.00 8795 .20 Monthly
Olds_Alero 2004 OA340-1 5 29.95 126 3773.70 23335.00 36010 .20 Monthly
Chry_PT_Crsr 2003 CPTC-MW2 4 37.95 26 986.70 15405.00 29020 .20 Weekly
Cadillac_Limo 1999 1999-01 18 142.50 4 570.00 38900.00 187419 .10 Weekly
Chev_M_Carlo 1997 CMC-21 6 27.30 55 1501.50 19437.50 113689 .20 Monthly
Chev_Suburban 1997 CSB-011 8 42.75 17 726.75 29999.00 137560 .20 Monthly
VW_Bus_T2A 1977 VWB-09 32 15.00 16 240.00 12000.00 397800 NA Daily
Ford_Stn_Wgn 1976 FSW-67 8 10.95 6 65.70 9899.00 149379 NA Whenever
Toy_Forklift 1997 6FGCU-45 1 61.25 65 3981.25 8795 732 .10 Yearly
Cat_Dozer(D7H) 1989 1989-11 1 98.00 5 490.00 67850.00 1304 .10 Yearly
";
?>

此处无需使用while循环。Foreach足够

<?php    
    if(isset($inventory['name'])){
        foreach($inventory as $key => $vehicles){
            if ($key !== 'seats' || $key !=='deprec' || $key !=='freq')
            {
               print $vehicles;
            }
            else{
               echo " ";
            }
        }
    }
?>

Blank的答案应该对您有效。我的应该是一个注释，但在回答中格式化代码要容易得多。

如果使用while只是家庭作业或测试的一个烦人的要求（根据你的评论…），你可以简单地解决它：

$finished = false;
while (!$finished) 
{
    //do all the work here - foreach loop and so on
    $finished = true;
}