为什么我的 IF 语句没有捕捉到中间的日期
Why does my IF statement doesn't catch the date in-between
我的数据库中有很多不同日期的记录,但我的代码没有捕捉到日期,也没有显示出来。有什么问题?
这是我的代码
$year = date("Y");
$sem1_s = date("M-d-Y", strtotime(date('Y') . '-8-1 00:00:00'));
$sem1_e = date("M-d-Y", strtotime(date('Y') . '-12-31 00:00:00'));
$sem2_s = date("M-d-Y", strtotime(date('Y') . '-01-1 00:00:00'));
$sem2_e = date("M-d-Y", strtotime(date('Y') . '-06-30 00:00:00'));
$date = '2015-10-15';
$date2 = date("M-d-Y", strtotime(date('Y') . '-3-1 00:00:00'));
if($date2 >= $sem1_s && $date2 <= $sem1_e){
echo $date2;
echo "First Sem";
}
else if($date2 >= $sem2_s && $date2 <= $sem2_e){
echo $date2;
echo "Second Sem";
}
else{
echo "error";
}
尝试像这样更改您的 if 语句
$year = date("Y");
$sem1_s = date("M-d-Y", strtotime(date('Y') . '-8-1 00:00:00'));
$sem1_e = date("M-d-Y", strtotime(date('Y') . '-12-31 00:00:00'));
$sem2_s = date("M-d-Y", strtotime(date('Y') . '-01-1 00:00:00'));
$sem2_e = date("M-d-Y", strtotime(date('Y') . '-06-30 00:00:00'));
$date = '2015-10-15';
$date2 = date("M-d-Y", strtotime(date('Y') . '-3-1 00:00:00'));
if($date2 >= $sem1_s || $date2 <= $sem1_e){
echo $date2;
echo "First Sem";
}
else if($date2 >= $sem2_s || $date2 <= $sem2_e){
echo $date2;
echo "Second Sem";
}
else{
echo "error";
}
我认为你不能在字符串中使用大于号或小于号
您应该将变量转换为 strtotime。
if(strtotime($date2) >= strtotime($sem1_s) && strtotime($date2) <= strtotime($sem1_e)){
echo $date2;
echo "First Sem";
}
else if(strtotime($date2) >= strtotime($sem2_s) && strtotime($date2) <= strtotime($sem2_e)){
echo $date2;
echo "Second Sem";
}
else{
echo "error";
在你的 if
语句中试试这个,正如我之前在你的问题下面的评论中提到的,问题出在你的 if
语句上。所以将其更改为:
if (strtotime($date2) >= strtotime($sem1_s) && strtotime($date2) <= strtotime($sem1_e))
因为您需要将日期转换为UNIX timestamp以便比较。
下面会return想要的结果,
if(strtotime($date2) >= strtotime($sem1_s) && strtotime($date2) <= strtotime($sem1_e)){
echo $date2;
echo "First Sem";
}
else if(strtotime($date2) >= strtotime($sem2_s) && strtotime($date2) <= strtotime($sem2_e)){
echo $date2;
echo "Second Sem";
}
else{
echo "error";
}
我的数据库中有很多不同日期的记录,但我的代码没有捕捉到日期,也没有显示出来。有什么问题?
这是我的代码
$year = date("Y");
$sem1_s = date("M-d-Y", strtotime(date('Y') . '-8-1 00:00:00'));
$sem1_e = date("M-d-Y", strtotime(date('Y') . '-12-31 00:00:00'));
$sem2_s = date("M-d-Y", strtotime(date('Y') . '-01-1 00:00:00'));
$sem2_e = date("M-d-Y", strtotime(date('Y') . '-06-30 00:00:00'));
$date = '2015-10-15';
$date2 = date("M-d-Y", strtotime(date('Y') . '-3-1 00:00:00'));
if($date2 >= $sem1_s && $date2 <= $sem1_e){
echo $date2;
echo "First Sem";
}
else if($date2 >= $sem2_s && $date2 <= $sem2_e){
echo $date2;
echo "Second Sem";
}
else{
echo "error";
}
尝试像这样更改您的 if 语句
$year = date("Y");
$sem1_s = date("M-d-Y", strtotime(date('Y') . '-8-1 00:00:00'));
$sem1_e = date("M-d-Y", strtotime(date('Y') . '-12-31 00:00:00'));
$sem2_s = date("M-d-Y", strtotime(date('Y') . '-01-1 00:00:00'));
$sem2_e = date("M-d-Y", strtotime(date('Y') . '-06-30 00:00:00'));
$date = '2015-10-15';
$date2 = date("M-d-Y", strtotime(date('Y') . '-3-1 00:00:00'));
if($date2 >= $sem1_s || $date2 <= $sem1_e){
echo $date2;
echo "First Sem";
}
else if($date2 >= $sem2_s || $date2 <= $sem2_e){
echo $date2;
echo "Second Sem";
}
else{
echo "error";
}
我认为你不能在字符串中使用大于号或小于号 您应该将变量转换为 strtotime。
if(strtotime($date2) >= strtotime($sem1_s) && strtotime($date2) <= strtotime($sem1_e)){
echo $date2;
echo "First Sem";
}
else if(strtotime($date2) >= strtotime($sem2_s) && strtotime($date2) <= strtotime($sem2_e)){
echo $date2;
echo "Second Sem";
}
else{
echo "error";
在你的 if
语句中试试这个,正如我之前在你的问题下面的评论中提到的,问题出在你的 if
语句上。所以将其更改为:
if (strtotime($date2) >= strtotime($sem1_s) && strtotime($date2) <= strtotime($sem1_e))
因为您需要将日期转换为UNIX timestamp以便比较。
下面会return想要的结果,
if(strtotime($date2) >= strtotime($sem1_s) && strtotime($date2) <= strtotime($sem1_e)){
echo $date2;
echo "First Sem";
}
else if(strtotime($date2) >= strtotime($sem2_s) && strtotime($date2) <= strtotime($sem2_e)){
echo $date2;
echo "Second Sem";
}
else{
echo "error";
}