Question

我有一个代码，它将以附加格式显示日志文件数据，在这里它将显示表格中的所有读数我只需要显示最新或最后阅读如何显示？请帮帮我。我已经在链接中附加了日志文件 Log File

 <meta http-equiv="refresh" content="10" > 
 <html>
 <h1><center>Online Real Time Temperature and Pressure Monitoring System</center></h1>
 <head>
 <style>
 table,th,td{
border:1px solid black;
border-collapse: collapse;
}
th,td{
padding: 5px;
}
</style>
</head>
<body>
<table align ="center" style="width:60%">
<tr>
<th>Year</th>
<th>Month</th>
<th>Date</th>
<th>Time</th>
<th>Sensor ID</th>
<th>Position</th>
<th>Pressure(psi)</th>
<th>Temperature</th>
</tr>
</body>
</html>
<?PHP
error_reporting(E_ALL & ~E_NOTICE);
$file_handle = fopen("D:/192.168.1.12_10000-gprs20160525.log", "rb");
while (!feof($file_handle) ) {
$line_of_text = fgets($file_handle);
$parts = explode(' ', $line_of_text);
$finalstr=$parts[0]."<BR>";
$hello=explode('>',end($parts));
$hello2=$hello[0]."<BR>";
$hello3=strlen($hello2);
if($hello3==23){
$timestamp=$hello2;
}
elseif($hello3==27)
{
$data=$hello2;
$hello4=explode('-',$timestamp."-".$data);
$year = substr($hello4[0],1,4);
$Month = substr($hello4[0],5,2);
$Date = substr($hello4[0],7,2);
$Hour = substr($hello4[0],9,2);
$Min = substr($hello4[0],11,2);
$sec =  substr($hello4[0],13,2);
$time= $Hour.":".$Min.":".$sec;
$sensorid1=substr($hello4[1],4,2);
$sensorid2=substr($hello4[1],7,2);
$Pressure1=substr($hello4[1],10,2);
$Pressure2=substr($hello4[1],13,2);
$temperature=substr($hello4[1],16,2);
$finalsensor=$sensorid1.$sensorid2;
$finalPressure=$Pressure1.$Pressure2;
$finalPressure1=(hexdec($finalPressure)-1531)/100+0.61;
$finaltemperature1=hexdec($temperature)-40;
$position="FL";

 ?>
 <html>
 <head>

 </head>
 <body>

  <tr>
  <td><center><?php echo ($year);?></center></td>
  <td><center><?php echo ($Month); ?></center></td>
  <td><center><?php echo ($Date); ?></center></td>
  <td><center><?php echo ($time); ?></center></td>
  <td><center><?php echo ($finalsensor); ?></center></td>
  <td><center><?php echo ($position); ?></center></td>
  <td><center><?php echo ($finalPressure1); ?></center></td>
  <td><center><?php echo ($finaltemperature1); ?></center></td>


  </tr>
  </body>
 </html>
  <?php
  }
  elseif($hello3==50)
  {
   echo "";
   }
   }
  fclose($file_handle);

   ?>

Answer 1

仅显示该文件中的最后一行。

计算该文件中的总行数，如果它不是最后一行，则迭代每一行并跳过该行。

Answer 2

每次检测到27个字符时，您的代码会重新分配$data，如果您只想打印最后一组结果，只需移动字符串分解（所有substr()）并回显部分外部while循环。

无需关闭并重新打开各部分之间的<html>和<body>标记。

如果您需要的是最新值，则应考虑重写代码。从底部到顶部读取日志，一旦检测到包含27个字符的行，找到包含23个字符的下一行，然后在第一个赋值实例中返回$hello4以打破循环，方式更有效且内存友好。

<meta http-equiv="refresh" content="10" > 
 <html>
 <h1><center>Online Real Time Temperature and Pressure Monitoring System</center></h1>
 <head>
 <style>
table,th,td{
border:1px solid black;
border-collapse: collapse;
}
th,td{
padding: 5px;
}
</style>
</head>
<body>
<table align ="center" style="width:60%">
<tr>
<th>Year</th>
<th>Month</th>
<th>Date</th>
<th>Time</th>
<th>Sensor ID</th>
<th>Position</th>
<th>Pressure(psi)</th>
<th>Temperature</th>
</tr>
<?php
error_reporting(E_ALL & ~E_NOTICE);
$file_handle = fopen("temp.log", "rb");
while (!feof($file_handle) ) {
    $line_of_text = fgets($file_handle);
    $parts = explode(' ', $line_of_text);
    $finalstr=$parts[0]."<BR>";
    $hello=explode('>',end($parts));
    $hello2=$hello[0]."<BR>";
    $hello3=strlen($hello2);
    if($hello3==23){
        $timestamp=$hello2;
    }
    elseif($hello3==27)
    {
        $data=$hello2;
        $hello4=explode('-',$timestamp."-".$data);
    }
    elseif ($hello3 == 50)
    {
        echo "";
    }
}
fclose($file_handle);
$year = substr($hello4[0], 1, 4);
$Month = substr($hello4[0], 5, 2);
$Date = substr($hello4[0], 7, 2);
$Hour = substr($hello4[0], 9, 2);
$Min = substr($hello4[0], 11, 2);
$sec = substr($hello4[0], 13, 2);
$time = $Hour . ":" . $Min . ":" . $sec;
$sensorid1 = substr($hello4[1], 4, 2);
$sensorid2 = substr($hello4[1], 7, 2);
$Pressure1 = substr($hello4[1], 10, 2);
$Pressure2 = substr($hello4[1], 13, 2);
$temperature = substr($hello4[1], 16, 2);
$finalsensor = $sensorid1 . $sensorid2;
$finalPressure = $Pressure1 . $Pressure2;
$finalPressure1 = (hexdec($finalPressure) - 1531) / 100 + 0.61;
$finaltemperature1 = hexdec($temperature) - 40;
$position = "FL";
?>
  <tr>
  <td><center><?php
echo ($year); ?></center></td>
  <td><center><?php
echo ($Month); ?></center></td>
  <td><center><?php
echo ($Date); ?></center></td>
  <td><center><?php
echo ($time); ?></center></td>
  <td><center><?php
echo ($finalsensor); ?></center></td>
  <td><center><?php
echo ($position); ?></center></td>
  <td><center><?php
echo ($finalPressure1); ?></center></td>
  <td><center><?php
echo ($finaltemperature1); ?></center></td>
  </tr>
  </body>
 </html>

php代码显示数组的最新读数

2 个答案: