Build comma separated string in PHP Loop [duplicate]

Question

Hello Guys i need to do this,

I have a common loop

foreach ($stuffs as $stuff) {
echo $stuff;
}

Lets assume $stuff is an 'id' of a mysql table what i have and i dont want to be showed in next results, so i want to build a string like this

1,23,54,67 (comma separated) 

So that string will be in mysql query to exclude results that already have been shown. how can i do that?

Should be with implode? How can i achieve that?

Answer 1

implode should be the tool:

implode(",", $stuffs);

will return a comma separated list.

Test

$myarray=array(1,2,"hello",4,5);
echo implode(",", $myarray);

returns

1,2,hello,4,5

Answer 2

If you really wanna have the loop:

$values = "";

foreach ($stuffs as $stuff) {
    $values != "" && $values .= ",";
    $values .= $stuff;
 }

echo $values;

I suggest using implode, but the loop can really give you more power if you wanna do some further stuff.