PHP

Question

您好，我在重写文件时遇到问题：

static function Remove($plate){

    $_parkedlist=parking::Read();
    $_remove = false;
    $_stillparkedlist = array();

    foreach($_parkedlist as $_car){

        if($_car[0] == $plate){

            $_firsttime = $_car[1];
            $_now = date('Y-m-d H:i:s');
            $_timelapse = strtotime($_now) - strtotime($_firsttime);


            $_topay = $_timelapse * 10;

            echo "$_topay <br>";

            $_remove = true;


        } else {

            $_stillparkedlist [] = $_car;

        }
    }

    if ($_remove == true){

        $mifile = fopen('parked.txt',"w");

        foreach($_stillparkedlist as $_car){    

            if($_car[0]!=""){

                    $_line = $_car[0]."=>".$_car[1]."\n";       
                    fwrite($mifile,$_line);
            }

        }

        fclose($mifile);
    }
}

原文件是这样的：

234FSC=>2016-09-07 17:06:23
JAG823=>2016-09-07 17:06:15
706KHB=>2016-09-07 17:06:15
980GHB=>2016-09-07 17:06:15

我第一次删除它时添加了空格（删除了 706KHB）

234FSC=>2016-09-07 17:06:23

JAG823=>2016-09-07 17:06:15

980GHB=>2016-09-07 17:06:15

如果我再次删除它会开始显示 "Notice: Undefined offset: 1 in ...\parking.php" 并且文件看起来像这样

234FSC=>2016-09-07 17:06:23

=>
JAG823=>2016-09-07 17:06:15

=>
980GHB=>2016-09-07 17:06:15

=>

我已经尝试了所有我能找到的，但即使使用 if($_car[0]!="") 和 isset($_car[0]!)

我怎样才能重写而不出现这个错误？

Answer 1

我假设从文件中读取的每一行都已经附加了换行符。

所以当你执行这一行时

$_line = $_car[0]."=>".$_car[1]."\n";

它正在添加另一个换行符，所以改为

$_line = $_car[0]."=>".$_car[1];

所以你没有添加另一个换行符

Answer 2

发生的事情是 fwrite 已经添加了一个 PHP_EOL，所以删除额外的 "\n"

然而，也许您应该重组数组以使事情变得更简单：

static function Remove($plate){
  $data = parking::Read();  

  // restructuring happens here.
  foreach($data as $car){
    $list[$car[0]] = $car[1];
  }

  foreach($list as $key => $val){
    if($key == $plate){
        $now     = date('Y-m-d H:i:s');
        $elapsed = strtotime($now) - strtotime($val);
        $price   = $elapsed * 10;

        echo $price;
        unset($list[$key]); // *poof*, removed the found car from the list.
        break;
    }
  }

  // if the new generated list is smaller then the original one, update.
  if(sizeof($list) != sizeof($data)){
    $fh = fopen('parked.txt',"w");
    foreach($list as $key => $val){
      fwrite($fh,"$key=>$plate");
    }
    fclose($fh);
   }
 }

这段代码还有一个怪癖，它会自动删除重复的条目。

PHP - 尝试重写文件但留下空白

PHP - Trying to re-write a file and it's leaving blank spaces

fwrite