Object of class stdClass could not be converted to string in laravel

Implode converts an array to a string. I dont think $ss is an array in your case, it looks like an object. That might be the reason you are getting this error.

Convert object in to array and then use implode. Implode takes first arguments as array.

<?php
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$ss=DB::select("SELECT  commercial_library FROM tbl_schedule");
$ss = (array) $ss;
$stringData = implode(', ', $ss);
fwrite($myfile, $stringData);
fclose($myfile);

You get Object of class stdClass could not be converted to string after converting $ss to array because you have still an array of objects. I tried to solve your problem using recursive function. I have both stdClasses and values on different levels. Please, replace my definition of $ss with your query and try my code.

$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");

$ss = new stdClass();
$ss->a = new stdClass();
$ss->a->a = new stdClass();
$ss->a->b = new stdClass();
$ss->b = new stdClass();

$ss->a->a->a = "!";
$ss->a->a->b = "T";
$ss->a->b->a = "E";
$ss->a->b->b = "X";
$ss->b->a = "T";
$ss->b->c = 1;

$string = recursive($ss, "");

fwrite($myfile, $string);
fclose($myfile);

function recursive($objects, $string) {
    foreach($objects as $object) {
        if ($object instanceof stdClass) {
            $string = recursive((array) $object, $string);
        } else {
            $string .= implode(', ', (array) $object); //my example is to concatenate
        }
    }
    return $string;
}