php mktime函数产生奇怪的符号

Question

I am trying to adapt a calendar script by David Walsh. In David's script showing a monthly calendar, for the first week it shows blanks before the month start but a commenter said you can use following code to display the dates from the previous month ie 28 20 30 depending on when the first day of the month falls.

I won't repeat all of the code from the script linked to, but the main thing is that the replacement code displays a symbol I have never seen before.., �30�. (I have copied these symbols from he source. They are squares that say FF above PD.). Here is code. Note $x, $running_day and $daysInThisWeek are just numbers. $calendar gets echoed at end.

//following prints out empty table cells

for($x = 0; $x < $running_day; $x++):
        $calendar.= '<td class="calendar-day-np">&nbsp;</td>';
        $days_in_this_week++;
    endfor;
echo $calendar;

//But following, echoed, prints out wierd symbols:

$daysInLastMonth = date(‘t’,mktime(0,0,0,$month-1,1,$year));

Then when you loop through as above you get a whole bunch of the wierd symbols.

for($x = 0; $x < $running_day; $x++): //this line is same as above
$calendar.= ' . ( ( $daysInLastMonth – ( $runningDay – 1 ) ) + $x ). ';
$daysInThisWeek++;
endfor;
echo $calendar;

Does anyone know what might be going on, what the wierd symbols mean and how to get this to display properly.

Thanks for any suggestions!

Answer 1

Turn on all errors and you will see that you have wrong quotes. Errors would be like

Notice: Use of undefined constant ‘t’ - assumed '‘t’'

This line

$daysInLastMonth = date(‘t’,mktime(0,0,0,$month-1,1,$year));

must be

$daysInLastMonth = date('t',mktime(0,0,0,$month-1,1,$year));