Php检查2次之间的2次

Question

我写了几行代码，但没有按需要工作。我需要他检查是否可以在已经使用的时间之外增加时间。也就是说，如果可能的话，早点和晚点。我会很感激你的帮助。

//rocord from db
$db_start = "07:00";
$db_end = "15:00";

//new entery
$start ="06:00";
$end = "16:00"; //shuld be erturn error
//exaples data to check
//$start ="06:00";
//$end = "07:00"; shuld be return ok
//$start ="06:00";
//$end = "17:00"; shuld be return error
//$start ="15:00";
//$end = "17:00"; shuld be return ok
//$start ="13:00";
//$end = "17:00"; shuld be return error
//$start ="11:00";
//$end = "14:00"; shuld be return error


$now = date("Y-m-d");

$date_db_start = strtotime($now.' '.$db_start);
$date_db_end = strtotime($now.' '.$db_end);
$date_start = strtotime($now.' '.$start);
$date_end = strtotime($now.' '.$end);
echo $db_start.' - '.$db_end;
echo '<br>';
echo $start.' - '.$end;
echo '<br>';

if ($date_start > $date_db_start && $date_start < $date_db_end) {
  echo 'error';
}elseif($date_end < $date_db_end && $date_end > $date_db_start) {
  echo 'error';
}elseif($date_start == $date_db_end){
  echo 'do someting';
}elseif($date_end == $date_db_start){
  echo 'do something';
}else{
  echo 'do someting';
}

Answer 1

    <?php
//rocord from db
$db_start = "07:00";
$db_end = "15:00";

//new entery
//$start ="06:00";
//$end = "16:00"; //shuld be erturn error
//exaples data to check
$start ="06:00";
$end = "07:00"; //shuld be return ok
//$start ="06:00";
//$end = "17:00"; shuld be return error
//$start ="15:00";
//$end = "17:00"; //shuld be return ok
//$start ="13:00";
//$end = "17:00"; shuld be return error
//$start ="11:00";
//$end = "14:00"; //shuld be return error


$now = date("Y-m-d");

$date_db_start = strtotime($now.' '.$db_start);
$date_db_end = strtotime($now.' '.$db_end);
$date_start = strtotime($now.' '.$start);
$date_end = strtotime($now.' '.$end);
echo $db_start.' - '.$db_end;
echo '<br>';
echo $start.' - '.$end;
echo '<br>';

if ($date_start > $date_db_start && $date_start < $date_db_end) {
  echo 'error';
} elseif($date_db_start>$date_start and $date_db_end<$date_end) {
    echo 'error';
}elseif($date_end < $date_db_end && $date_start > $date_db_start) {
  echo 'error';
}elseif($date_start == $date_db_end){
  echo 'do someting';
}elseif($date_end == $date_db_start){
  echo 'do something';
}else{
  echo 'do someting';
}

Php检查2次之间的2次

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