从do / while循环创建一串值

Question

I am trying to create a php string with integers separated by commas. The values for the string are coming from a do { }while loop. How would I do this?

//GRAB EC DATA
    $mysql_ec_data = "SELECT `ec_c_id` FROM `e_c` WHERE `ec_id` = '$e_id'";
    $query_ec_data = mysql_query($mysql_ec_data) or die(mysql_error());
    $ec_data = mysql_fetch_assoc($query_ec_data);   

    $string = "";           
    do {

        //There will be values looping through here that I want to add to a single string.
        $string =+ $ec_data['ec_id'];               

    } while ($ec_data = mysql_fetch_assoc($query_ec_data)); 
    //this is how the values from the while loop should look in the string at the end
    $string = 45,52,23;

Answer 1

用这个：

$string .= $ec_data['ec_id'] . ', '; 

Answer 2

You could use $string =+ $ec_data['ec_id'] . ", "; $string =+ $ec_data['ec_id'] . ", "; and after the loop remove the last comma with PHP substr method: http://nl1.php.net/substr

$string = substr($string, 0, -1);

Answer 3

Be careful with your assignment-concatenation operator, in PHP it is .= . A simple way to handle the comma delimiter is to first put the integers in an array and then "glue" them together after the loop:

$string = "";
$integers = array();           
do {
    $intgers[] = $ec_data['ec_id'];               

} while ($ec_data = mysql_fetch_assoc($query_ec_data)); 

if (count($integers)) {
   $string = implode(",", $integers);
}