<?php $arr = [ 'one@gmail.com' => [ '70,80', '90,100' ], 'two@gmail.com' => [ '10' ] ]; array_walk($arr, function (&$item, $key) { $item = "key: {$key}". PHP_EOL ."value: " . implode(" ", $item); }); echo implode(PHP_EOL . PHP_EOL, $arr);
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