<?php $arr = [ 0 => [ "name" => "A1", "project" => [ 0 => "New Project", ], ], 1 => [ "name" => "A2", "project" => [ 0 => "New Project", 2 => "Project", ], ], ]; array_walk($arr, function (&$val) { $val['project'] = implode(",", $val['project']); }); print_r($arr);
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