I could do so
$array = array(12, 14, 121, 123);
$var = $array[0].", ".$array[1].", ".......
echo $var
But how do I do if I do not know the exact size of the array ?
Because I'm getting it through a post that comes from a <select multiple="multiple"></select>
So you can not tell the exact size of it.
This is probably what you want:
$array = array(12, 14, 121, 123);
$var = "";
foreach ($array as $item) {
$var .= $item . " ";
}
echo $var;
See running on ideone .
Compound Assignment Operator's Manual .
This way you scan all the elements. There are several other ways to achieve the same effect, but this is the most appropriate.
In this specific case you can do something simpler:
implode($array, ", ");
Another solution, formatting the way you suggested in the question, comma:
$array = array(12, 14, 121, 123);
$newVar = "";
$arrayLength = count($array);
for($i = 0; $i < $arrayLength; $i++){
if($i == ($arrayLength-1)){
$newVar .= $array[$i];
}else{
$newVar .= $array[$i].",";
}
}
echo $newVar;