Question

I´m trying using php to generate a set of “{URL.callback}” to use in javascript. By using database. Here is my code:

$sql="select * from search where keywords LIKE '$bb%' ORDER BY keywords ";  

     $result=mysql_db_query($dbname,$sql);

     echo $_GET["callback"] . "({ t:\"$t\", r:[";
    while ( $rs=mysql_fetch_array($result))    {
        $keywords=$rs[keywords];

         echo "" ."\"$keywords\"".","." ";
    }

echo"] })";

This is the code it returns:

({ t:"", r:["example1", "example2", "example3",] })

Everything seemed to be correct except the (,) in the end (after “example3”) that I want to get rid. because it´s not correct and can not be use with that.

The question is: How to generate it correctly ? How to get rid the last (,) ?

Answer 1

Solution

Create data structure (multi-dimensional array) within PHP and let json_encode() generate JS data structure.

Example

It could look like this:

$sql="select * from search where keywords LIKE '$bb%' ORDER BY keywords ";  
$result=mysql_db_query($dbname,$sql);

$data = array(
    't' => $t,
    'r' => array(),
);

while ( $rs=mysql_fetch_array($result)) {
    $data['r'][] = $rs['keywords'];
};

and then display it like that:

echo $_GET["callback"].'('.json_encode($data).');';