`json_encode` not working with explode - php

Question

I have a string containing numbers separated by comma. ie, 1,2,3,6.... I have removed the comma using explode. Now i want to match the corresponding values in database.
My Code is,
$color = "1,2,3,9,5";
$color_split = explode(",", $color);
foreach($color_split as $item)
{
$select_color = "SELECT * FROM tbl_product_color WHERE color_id = '$item'";
$select_color_q = mysqli_query($c, $select_color) or die(mysqli_error($c));
$length = mysqli_num_rows($select_color_q);
if($length > 0)
{
while($select_color_r = mysqli_fetch_object($select_color_q))
{
$var[] = $select_color_r;
}
$var = json_encode($var);
echo '{"color_list":'.$var.'}';
}
else
{
$arr = array('status'=>"notfound");
echo '{"color_list":['.json_encode($arr).']}';
}
}
Now the output is,
{"color_list":[{"color_id":"1","color_name":"White","color_code":"#f2f2f2"}]}
and one error,
Fatal error: [] operator not supported for strings in C:\wamp\www\jithin\get_color.php on line 18
line 18 contains $var[] = $select_color_r;
My required output is,
{"color_list":[{"color_id":"1","color_name":"White","color_code":"#f2f2f2"},{"color_id":"2","color_name":"Black","color_code":"#000000"},{"color_id":"3","color_name":"Red","color_code":"#F000000"},...]}

Answer 1

You don't need to use foreach and explode over here you can simply update your MySql query and code like as
$color = "1,2,3,9,5";
$select_color = "SELECT * FROM tbl_product_color WHERE color_id IN ($color)";
$select_color_q = mysqli_query($c, $select_color) or die(mysqli_error($c));
$arr['color_list'] = array();
if(mysqli_num_rows($select_color_q) > 0)
{
while($select_color_r = mysqli_fetch_object($select_color_q))
{
$var[] = $select_color_r;
}
}else{
$var = array('status'=>"notfound");
}
$arr['color_list'] = $var;
echo json_encode($arr);

Answer 2

you set $var as string in here :
$var = json_encode($var);
but in the next step of foreach you want to use $var as array.
$var[] = $select_color_r;
just remove the following line :
$var = json_encode($var);
and change this line :
echo '{"color_list":'.$var.'}';
to
echo '{"color_list":'.json_encode($var);.'}';