How to solve the problem of -0 in php countdown

This article mainly introduces how to solve the problem of -0 when the PHP countdown program appears. The example analyzes the reasons why the PHP countdown program appears -0 and the corresponding solutions. It has certain reference value. Friends who need it can refer to it

The details are as follows:

Question:There was feedback today that the countdown showed -0 days. I looked at the program and, damn, I didn’t test it at the time

The reason is that PHP's logical judgment is -0 > 0

Analysis: Post the wrong code

$starttime   = 1362585600; //3.7凌晨
$nowtime   = 1362618921;//3.7早上
$off = ceil(($starttime - $nowtime)/86400); //倒计时
if ($off < 0) {
  $off = 0;
}
$b = $starttime - $nowtime;
$c = $b/86400;
$d = ceil($c);
var_dump(array(&#39;start-now&#39;=>$b), array(&#39;float_day&#39;=>$c), array(&#39;int_day&#39;=>$d), array(&#39;off&#39;=>$off));
if (-0 < 0) {
  echo &#39;-0 < 0&#39;;
} else {
  echo &#39;-0 > 0&#39;;
}

Output:

array
 'start-now' => int -33321
array
 'float_day' => float -0.385659722222
array
 'int_day' => float -0
array
 'off' => float -0
-0 > 0

Process:

When the start time and the current time are the same day, the above Since -0 > 0, the calculation process will be off = -0.

Improvement:

$starttime   = 1362585600; //3.7凌晨
$nowtime   = 1362618921;//3.7早上
if (($starttime - $nowtime) < 0) {
  $off = 0;
} else {
  $off = ceil(($starttime - $nowtime)/86400);
}

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