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@ 2017-08-25T09:01:40Z

<?php

$arr =Array
(
    0 => Array
        (
            0 => 8147,
            1 => 3
        ),

    1 => Array
        (
            0 => 8204,
            1 => 20
        )

);
$match_array = array_column($arr,0);

$str =  implode(",",$match_array);
echo $str;

Output
Performance
VLD
References
Branches

array_column: documentation ( source)
implode: documentation ( source)

preferences:dark modelive previewkey bindings

28.44 ms | 405 KiB | 5 Q