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@ 2019-07-16T06:51:58Z

<?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);

Output
Performance
VLD
References
Branches

implode: documentation ( source)
array_walk: documentation ( source)

preferences:dark modelive previewkey bindings

102.36 ms | 1450 KiB | 5 Q