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Top Forums Programming [C language] system function print output when not expected. Post 302418475 by ejdv on Tuesday 4th of May 2010 11:42:31 AM
Old 05-04-2010
Thanks.

That explained why I did not see the return values.
But the command output is still printed.

Code:
-> main()
main() passing_var  = datum
-> date()
date() passing_var  = datum
date() command      = date
Tue May  4 15:10:34 GMT 2010
date() date_return  = 0
<- date()
main() return_value = 0
<- main()

Probably the command function is not what I need.
I just read that the command function just executes the command and only delivers the exit value of the command executed.
Perhaps I can make use of this.
I do not need the date output, that was just as an example.
I only need an integer, so I will try to use the exit value for this.

---------- Post updated at 05:42 PM ---------- Previous update was at 05:19 PM ----------

As I have control over the exit value of the command executed, I can have the output go to "> /dev/null 2&>1".
Then with "WEXITSTATUS" I can parse the exit value to my variable.

Slowly getting there :-)
 

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DATETIME.__CONSTRUCT(3) 						 1						   DATETIME.__CONSTRUCT(3)

DateTime::__construct - Returns new DateTime object

       Object oriented style

SYNOPSIS
public DateTime::__construct NULL ([string $time = "now"], [DateTimeZone $timezone]) DESCRIPTION
Procedural style DateTime date_create NULL ([string $time = "now"], [DateTimeZone $timezone]) Returns new DateTime object. PARAMETERS
o $time -A date/time string. Valid formats are explained in Date and Time Formats. Enter NULL here to obtain the current time when using the $timezone parameter. o $timezone - A DateTimeZone object representing the timezone of $time. If $timezone is omitted, the current timezone will be used. Note The $timezone parameter and the current timezone are ignored when the $time parameter either is a UNIX timestamp (e.g. @946684800) or specifies a timezone (e.g. 2010-01-28T15:00:00+02:00). RETURN VALUES
Returns a new DateTime instance. Procedural style returns FALSE on failure. ERRORS
/EXCEPTIONS Emits Exception in case of an error. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.3.0 | | | | | | | If $time contains an invalid date/time format, | | | then an exception is now thrown. Previously an | | | error was emitted. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 DateTime.__construct(3) example Object oriented style <?php try { $date = new DateTime('2000-01-01'); } catch (Exception $e) { echo $e->getMessage(); exit(1); } echo $date->format('Y-m-d'); ?> Procedural style <?php $date = date_create('2000-01-01'); if (!$date) { $e = date_get_last_errors(); foreach ($e['errors'] as $error) { echo "$error "; } exit(1); } echo date_format($date, 'Y-m-d'); ?> The above examples will output: 2000-01-01 Example #2 Intricacies of DateTime.__construct(3) <?php // Specified date/time in your computer's time zone. $date = new DateTime('2000-01-01'); echo $date->format('Y-m-d H:i:sP') . " "; // Specified date/time in the specified time zone. $date = new DateTime('2000-01-01', new DateTimeZone('Pacific/Nauru')); echo $date->format('Y-m-d H:i:sP') . " "; // Current date/time in your computer's time zone. $date = new DateTime(); echo $date->format('Y-m-d H:i:sP') . " "; // Current date/time in the specified time zone. $date = new DateTime(null, new DateTimeZone('Pacific/Nauru')); echo $date->format('Y-m-d H:i:sP') . " "; // Using a UNIX timestamp. Notice the result is in the UTC time zone. $date = new DateTime('@946684800'); echo $date->format('Y-m-d H:i:sP') . " "; // Non-existent values roll over. $date = new DateTime('2000-02-30'); echo $date->format('Y-m-d H:i:sP') . " "; ?> The above example will output something similar to: 2000-01-01 00:00:00-05:00 2000-01-01 00:00:00+12:00 2010-04-24 10:24:16-04:00 2010-04-25 02:24:16+12:00 2000-01-01 00:00:00+00:00 2000-03-01 00:00:00-05:00 SEE ALSO
DateTime.createFromFormat(3), DateTimeZone.__construct(3), Date and Time Formats, date.timezone ini setting, date_default_time- zone_set(3), DateTime.getLastErrors(3), checkdate(3). PHP Documentation Group DATETIME.__CONSTRUCT(3)
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