PHP concatenated string part desaperas

[bilibytes]

Hi,
I am having a problem with a concatenated string.
I start my string outside of a for() and then, concatenate the string generated with the loop to it.

the string out of the loop looks like this:
$q = "INSERT INTO (asdf1,asdf2,as df3) VALUES"

then when i add something like this:
$q .="('".$asdf1." ', '".$asdf2."' , '".$asdf3."' )"

when i make the query, mysql returns syntax error because the final string looks something like this:

"INSERT INTO (asdf1,asdf2,as df3) VALUESasdf1', 'asdf2', 'asdf3')asdf1', 'asdf2', 'asdf3')asdf1', 'asdf2', 'asdf3')asdf1', 'asdf2', 'asdf3')...

So the first part of the concatenated string:"('" ,seem to desapear.

I simplified the query string to focus on the real problem...

here is the function code:

/* Insert new content into calendar */
    private function insert_into_calendar(){
 
        /* Create mysql query code */
        $this->query = 'INSERT INTO calendar (date_id, date, hour, hour_state, hour_sub, hour_sub_state) VALUES';
        $first = true;
        for($i = 1; $i<= $this->days_to_add ; $i++){ //DATE
            $date_to_add = date("d.m.y", mktime(0, 0, 0, $this->table_max_date_exploded['m']  , $this->table_max_date_exploded['d']+$i, "20".$this->table_max_date_exploded['y']));
 
            for($j = Calendar_auto_updater::DAY_HOUR_START; $j <= Calendar_auto_updater::DAY_HOUR_END; $j++){ //HOUR
                $hour = $j.":00";
 
                for($k = 0; $k <= $this->hour_sub_max; $k += $this->hour_fraction){ //HOUR_SUB
                    if($k == 0){ //allways want an hour format of this kind "hh:mm"
                        $hour_sub = $j.":".$k."0";
                    }
                    else{
                        $hour_sub = $j.":".$k;
                    }
 
                    if($first == true){ //only want to put a "," before the "(" if its not just after "VALUES" SQL SYNAX
 
                        $this->query .='(\''.$this->table_max_date_id+$i.'\', \''.$date_to_add.'\', \''.$hour.'\', \'0\', \''.$hour_sub.'\',  \'0\')';
                        $first = false;
                    }
                    else{
                        $this->query .=', (\''.$this->table_max_date_id+$i.'\', \''.$date_to_add.'\', \''.$hour.'\', \'0\', \''.$hour_sub.'\', \'0\' )';
                    }
                }
            }
        }
        print $this->query;
 
        /* Make query */
        $result = mysql_query($this->query, $this->connection) or die(mysql_error());
        if($result == true){
            return true;
        }
        else{
            $this->error['insert'] = "Error while inserting";
            return false;
        }
}
 

if you have any suggestions... please let me know

Thank you very much,


Best Regards,

[Atli]

Hi.

The only thing I can see that *might* be causing this is the math in the first variable you add:
Similar to:

$var = "(". 1 + 1 .")";
 

Try encapsulating that, like:

$var = "(". (1 + 1) .")";
 

[bilibytes]

Hi.

The only thing I can see that *might* be causing this is the math in the first variable you add:
Similar to:

$var = "(". 1 + 1 .")";
 

Try encapsulating that, like:

$var = "(". (1 + 1) .")";
 

thank you very much for taking your time.

i have solved this problem by putting the "('" into different variables, and then i have concatenated them with the rest, it has worked properly, although i will try what you said just for intellectual curiosity. :)

thank you again

bilibytes

[pbmods]

'+' and '.' have the same order of precedence and left associativity, so they will be evaluated from left to right unless you use parenthesis.

E.g,:

'a' . 1 + 1 . 'b' = '1b'; // ((('a' . 1) + 1) . 'b')
'a' . (1 + 1) . 'b' = 'a2b';
 

http://php.net/operators