- array_map: documentation ( source)
- var_dump: documentation ( source)
- implode: documentation ( source)
<?php
$test_array = [(object) ['title' => 1], (object) ['title' => 2], (object) ['title' => 3]];
$result = implode(',', array_map(function($item)
{ return $item->title; }, $test_array));
var_dump($result); // string(5) "1,2,3"