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<?php $arr = [ ["good" => 1, "material" => "salt"], ["good" => 1, "material" => "sugar"], ["good" => 5, "material" => "coffee"], ["good" => 5, "material" => "milk"], ["good" => 5, "material" => "cocoa"], ["good" => 11, "material" => "dumplings"] ]; for ($i = 0; $i < count($arr); $i++) { $str[$arr[$i]['good']] .= isset($str[$arr[$i]['good']]) ? ",".$arr[$i]["material"] : $arr[$i]["material"]; } var_dump($str);
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